Document:

Exhibit 4.20

 

Exclusive Call Option Agreement

 

(English Translation)

 

This Exclusive Call Option Agreement (hereinafter
referred to as this “Agreement”) is executed by and among the following parties on June 24, 2018 in Beijing, China:

 

Party
A:       Chema Technology (Beijing) Co., Ltd., a solely foreign-owned
enterprise incorporated and existing in accordance with the laws of the People’s Republic of China (“China”), and the
address is 931, 9F, 21 Yangfangdian Road, Haidian District, Beijing;

 

	Party B:	
    Wen Wei, a Chinese citizen, ID card number:

    Sun Jianchen, a Chinese citizen, ID card
    number:

    Cheng Congwu, a Chinese citizen, ID card
    number:

 

and

 

Party
C:       Tansuo Jixian Technology (Beijing) Co., Ltd., a limited
liability company incorporated and existing in accordance with Chinese laws, and the address is 929, 9F, 21 Yangfangdian Road, Haidian
District, Beijing.

 

In this Agreement, Party A, Party B and Party
C are hereinafter each referred to as a “Party” and collectively referred to as the “Parties”.

 

Whereas:

 

Party B holds 100% of the equity interests in
Party C;

 

Now the Parties enter into the following agreement
through negotiation:

 

1.      Sale
and Purchase of Equity

 

1.1        Grant
of right

 

Party B hereby irrevocably grants Party
A an irrevocable exclusive right to purchase or designate a Person or Persons (each referred to as a “Designated Person”)
to purchase at any time from Party B all or part of the equity held by it in Party C at one time or multiple times by steps decided by
Party A at its own discretion at the price stated in Article 1.3 hereof, to the extent permitted by Chinese laws (the “Purchasing
Right”). No one other than Party A and the Designated Persons may enjoy the Purchasing Right or other rights in relation to Party
B’s equity. Party C hereby consents to the grant of the Purchasing Right by Party B to Party A. The term “Person” referred
to in this clause and this Agreement means individual, company, joint venture, partnership, enterprise, trust or non-corporate organization.

 

     

     

    

 

1.2        Exercising
steps

 

Party A shall exercise its Purchasing
Right in compliance with the provisions of Chinese laws and regulations. To exercise its Purchasing Right, Party A shall notify Party
B in writing (the “Purchase Notice”), specifying the following matters: (a) Party A’s decision on the exercise
of the Purchasing Right; (b) the equity shares Party A intends to purchase from Party B (the “Purchased Equity”); and
(c) the date of purchase/transfer of the Purchased Equity.

 

1.3        Purchase
Price

 

Unless assessment is required by Chinese
laws or regulations at the time when Party A exercises its Purchasing Right, the purchase price of the Purchased Equity (the “Purchase
Price”) shall be the lowest price permitted by the law.

 

1.4        Transfer
of the Purchased Equity

 

Each time Party A exercises its Purchasing
Right:

 

		1.4.1	Party B shall cause Party C to hold in a timely manner a shareholders’ meeting, in which a resolution
on approval of the transfer by Party B of the Purchased Equity to Party A and/or the Designated Persons shall be adopted;

 

		1.4.2	Party B shall execute an equity transfer contract (hereinafter referred to as the “Transfer Contract”)
for each transfer with Party A and/or (if applicable) the Designated Persons in accordance with the provisions hereof and the Purchase
Notice;

 

		1.4.3	Relevant parties shall execute all other necessary contracts, agreements or documents, obtain all necessary
government licenses and permissions, and take all necessary actions to transfer the good title to the Purchased Equity to Party A and/or
the Designated Persons without any Security Interest thereon, and cause Party A and/or the Designated Persons to become the registered
owner of the Purchased Equity. For the purpose of this clause and this Agreement, “Security Interest” includes guarantees,
mortgages, third party rights or interests, any share options, acquisition rights, preemptive rights, setoff rights, retention of title
or other guarantee arrangements; provided that for the purpose of clarity, any security interest incurred under this Agreement and Party
B’s Equity Pledge Agreement and Powers of Attorney are excluded. “Party B’s Equity Pledge Agreement” referred
to in this clause and this Agreement means the Equity Pledge Agreement executed by Party A, Party B and Party C on the date of execution
hereof (hereinafter referred to as the “Equity Pledge Agreement”) and any modification and modification thereto or
restatement thereof, according to which Party B pledges all of its equity in Party C to Party A in order to ensure that Party B and Party
C can perform their obligations under relevant transaction documents executed by them with Party A; “Party B’s Powers of
Attorney” referred to herein means the Powers of Attorney executed by Party B on the date of execution hereof to grant authority
to Party A and any modification and amendment thereto or restatement thereof.

 

     

     

    

 

		1.4.4	Upon the exercise by Party A of its Purchasing Right, to the extent permitted by Chinese laws, Party B
shall return all of the Purchase Price and dividends received by it hereunder to Party A.

 

2.      Undertakings

 

2.1        Undertakings
in relation to Party B and Party C

 

Party B (as Party C’s shareholders)
and Party C hereby undertake that:

 

		2.1.1	Without the written consent of Party A, they may not by any means supplement, change or amend Party C’s
articles of association and rules and regulations, increase or reduce its registered capital, or in other ways change the structure
of its registered capital;

 

		2.1.2	They will maintain the existence of the company and prudently and effectively operate its business and
handle its affairs in accordance with good financial and business standards and practices;

 

		2.1.3	Without the prior written consent of Party A, they will not sell, transfer, pledge or by any other means
dispose of any legal or beneficial interest in Party C’s assets, business or income or have the same encumbered with any Security
Interest at any time as of the date of execution hereof;

 

		2.1.4	Without the prior written consent of Party A, no debt will be incurred, inherited, guaranteed or allowed
to exist, except for: (i) debts arising from the normal course of business rather than the obtaining of loans, and (ii) debts
that have been disclosed to and approved in writing by Party A;

 

     

     

    

 

		2.1.5	They have been operating all of Party C’s business during normal course of business, so as to maintain
the value of Party B’s assets, and will not engage in any act/omission that may affect its business status and asset value;

 

		2.1.6	Without the prior written consent of Party A, Party C may not be urged to execute any material contract,
except for those executed during normal course of business (for the purpose of this Paragraph, a contract will be deemed as a material
one if its value exceeds RMB 100,000);

 

		2.1.7	Without the prior written consent of Party A, Party C may not be urged to provide any loan or credit for
anyone;

 

		2.1.8	They will provide all materials in relation to Party C’s operation and financial conditions for
Party A at the request of Party A;

 

		2.1.9	They shall, if any request is made by Party A, take out and hold insurance in relation to Party C’s
assets and business from an insurance company approved by Party A, the amount of and the risks covered by which shall be in line with
that of and those covered by the insurance purchased by companies engaged in similar business;

 

		2.1.10	Without the prior written consent of Party A, Party C may not be urged or permitted to merge or consolidate
with anyone or acquire or invest in anyone;

 

		2.1.11	Without the prior written consent of Party A, Party C may not be liquidated, dissolved or deregistered;

 

		2.1.12	They shall forthwith notify Party A of any litigation, arbitration or administrative procedure that will
or may arise in relation to Party C’s assets, business or income;

 

		2.1.13	They shall execute all necessary or appropriate documents, take all necessary or appropriate actions,
file all necessary or appropriate claims, or make necessary and appropriate defense against all claims, so as to maintain Party C’s
title to all of its assets;

 

		2.1.14	Without the prior written consent of Party A, they shall ensure that Party C may not by any means distribute
any dividends to its shareholders, provided that once requested by Party A in writing, Party C shall forthwith distribute all distributable
profits to its shareholders;

 

		2.1.15	If requested by Party A (or its parent company or the liquidation manager thereof), they shall dispose
of all of Party C’s assets by means as required by Party A (or its parent company or the liquidation manager thereof);

 

     

     

    

 

		2.1.16	At the request of Party A, they shall appoint any personnel designated by it to serve as Party C’s
director; and

 

		2.1.17	Unless in accordance with the mandatory requirements of Chinese laws, without the written consent of Party
A, Party C may not be dissolved or liquidated.

 

2.2        Party
B’s undertakings:

 

Party B hereby undertakes that:

 

		2.2.1	Without the prior written consent of Party A, it may not sell, transfer, mortgage or by any other means
dispose of any legal or beneficial interest in the equity of Party C owned by it, or have the same encumbered with any Security Interest,
except for those under Party B’s Equity Pledge Agreement and Powers of Attorney;

 

		2.2.2	Party B shall procure that Party C’s board of shareholders and/or board of directors will not approve
without the prior written consent of Party A any sale, transfer, mortgage or disposition in any other way of any legal or beneficial interest
in the equity of Party C owned by Party B, or have the same encumbered with any Security Interest, except for those under Party B’s
Equity Pledge Agreement and Powers of Attorney;

 

		2.2.3	Without the prior written consent of Party A, Party B shall procure that Party C’s board of shareholders
or board of directors will not approve any merger or consolidation with anyone or any acquisition of or investment in anyone;

 

		2.2.4	Party B shall forthwith notify Party A of any litigation, arbitration or administrative procedure that
will or may arise in relation to equity of Party C owned by it;

 

		2.2.5	Party B shall procure that Party C’s board of shareholders or board of directors will approve the
transfer of the Purchased Equity hereunder and take any and all other actions that may be requested by Party A;

 

		2.2.6	Party B shall execute all necessary or appropriate documents, take all necessary or appropriate actions,
file all necessary or appropriate claims, or make necessary and appropriate defense against all claims, so as to maintain its title to
the equity of Party C;

 

     

     

    

 

		2.2.7	At the request of Party A, Party B shall appoint any personnel designated by it to serve as Party C’s
director;

 

		2.2.8	At the request of Party A at any time, Party B shall forthwith and unconditionally transfer its equity
in Party C to Party A and/the Designated Persons based on the Purchasing Right hereunder, and Party B hereby waives its preemptive right
(if any) to transfer equity to another existing shareholder of Party C; and

 

		2.2.9	Party B shall strictly comply with the provisions of this Agreement and other contracts executed by Party
B and Party C jointly or separately with Party A, perform its obligations thereunder, and not engage in any act/omission that may affect
the validity and enforceability thereof. Where any Party B owns any residual right to the equity under this Agreement, the Equity Pledge
Agreement executed by the Parties hereto, or the Powers of Attorney granted with Party A as the beneficiary, unless as instructed by Party
A in writing, such Party B may not exercise such right.

 

3.      Representations
and Warranties

 

Party B and Party C hereby jointly and
separately represent and warrant to Party A on the date of execution hereof and each date of transfer of the Purchased Equity as follows:

 

		3.1	They are authorized to execute and deliver this Agreement and any Transfer Contract and perform their
obligations thereunder. They agree to execute a Transfer Contract in line with the terms hereof at the time when Party A exercises its
Purchasing Right. This Agreement and Transfer Contracts to which they are a party constitute or will constitute their legal, valid and
binding obligations and shall be enforceable for them in accordance with the terms thereof;

 

		3.2	They have obtained the consent and approval of third parties and government authorities (if required)
to execute, deliver and perform this Agreement; neither the execution and delivery of nor the obligations under this Agreement or any
Transfer Contract will: (i) result in any violation of any applicable Chinese law; (ii) conflict with the articles of association,
rules and regulations or other organizational documents of Party C; (iii) result in violation of or constitute any breach of
contract under any contract or instrument to which they are a party or which is binding upon them; (iv) result in any violation of
any condition for the grant and/or continued validity of any license or permit issued to either of them; or (v) result in the suspension
or revocation of or additional conditions for any license or permit issued to either of them;

 

     

     

    

 

		3.3	Each Party B owns good and merchantable title to the equity held by it in Party C, and has not encumbered
the same with any Security Interest other than those under its Equity Pledge Agreement and Powers of Attorney.

 

		3.4	Party C owns good and merchantable title to all of its assets, and has not encumbered the aforesaid assets
with any Security Interest;

 

		3.5	Party C does not have any outstanding debt, except for (i) debts arising from the normal course of
business, and (ii) debts that have been disclosed to and approved in writing by Party A;

 

		3.6	There is no pending or threatened litigation, arbitration or administrative procedure in relation to Party
C or its equity or assets.

 

4.      Date
of Effectiveness

 

This Agreement shall take effect as of
the date of execution hereof by the Parties, and this agreement will be terminated upon the transfer in accordance with the law of the
equity held by Party B in Party C to Party A and/or other Persons designated by it.

 

5.      Applicable
Laws and Dispute Settlement

 

		5.1	Applicable laws

 

The execution, effectiveness, interpretation,
performance, modification and termination hereof and the settlement of disputes hereunder shall be governed by laws formally promulgated
and publicly available in China. Anything not covered by such laws shall be governed by international legal principles and practices.

 

		5.2	Settlement of disputes

 

Any dispute arising from the interpretation
and performance hereof shall be settled by the Parties through friendly negotiation first. Where the Parties fail to reach any agreement
on the settlement of such dispute within 30 days after a request for settlement of the dispute through negotiation is made by any Party
to the other Parties, any Party may submit the dispute to China International Economic and Trade Arbitration Commission for settlement
in accordance with its then effective arbitration rules. The arbitration shall be held in Beijing, and the language of the arbitration
shall be Chinese. The arbitration award shall be final and binding upon the Parties.

 

6.      Taxes
and Fees

 

Each Party shall pay any and all transfer
and registration taxes, expenses and fees incurred by or imposed on such Party in accordance with Chinese laws with respect to the preparation
and execution of this Agreement and Transfer Contracts and the completion of the transactions thereunder.

 

7.      Notice

 

		7.1	All notices and other communications to be sent as required or permitted hereunder shall be sent by personal
delivery or postage prepaid registered mail, commercial courier service or fax to the following address of the receiving Party. For each
notice, a confirmation letter shall be sent via email. Such notice shall be deemed effectively delivered on:

 

		7.1.1	the date of delivery or rejection at the designated receiving address, if sent by personal delivery, courier
service or postage prepaid registered mail; or

 

		7.1.2	the date of successful transmission (evidenced by an automatically generated message confirming the transmission),
if sent by fax.

 

		7.2	For the purpose of notice, the Parties’ addresses are as follows:

 

Party A: Chema
Technology (Beijing) Co., Ltd.

Add: 931, 9F, 21
Yangfangdian Road, Haidian District, Beijing

Attn: Wen Wei

Tel: 010-6396066

Fax: N/A

 

Part B:
Wen Wei, Sun Jianchen

		Add:	[ ]

		Attn:	[ ]

		Tel:	[ ]

		Fax:	[ ]

 

Party B: Cheng
Congwu

		Add:	[ ]

		Attn:	[ ]

		Tel:	[ ]

		Fax:	[ ]

 

     

     

    

 

Party C: Tansuo
Jixian Technology (Beijing) Co., Ltd.

Add: 9F, 21 Yangfangdian
Road, Haidian District, Beijing

Attn: Wen Wei

Tel: 010-6396066,
4006969123

Fax: 010-6396066

 

		7.3	Any Party may change at any time its address for the receipt of notices by notifying the other Parties
in accordance with the terms of this clause.

 

8.      Confidentiality
Liability

 

The Parties acknowledge that any oral
or written information exchanged in respect hereof shall be confidential information. Each Party shall keep confidential all such information
and, without the written consent of the other Parties, may not disclose to any third party any relevant information, unless: (a) the
public is or will be aware of such information (which is not caused by any disclosure by the receiving Party to the public); (b) such
information shall be disclosed as required by applicable laws or the rules or provisions of any securities exchange; (c) any
Party is required to disclose such information to its legal consultant or financial consultant with respect to any transaction provided
for hereunder, and such legal consultant or financial consultant is also required to be bound by confidentiality obligation similar to
that provided for in this clause. The disclosure of any confidential information by any staff or organization employed by any Party shall
be deemed as disclosure of such confidential information by such Party, and such Party shall bear legal liability for its violation hereof.
This clause shall survive the termination hereof for whatever reason.

 

9.      Further
Warranties

 

The Parties agree to promptly execute
documents and take further actions reasonably required for or favorable to the implementation of the provisions and purposes hereof.

 

10.   Miscellaneous

 

		10.1	Amendment, change and supplement

 

Any amendment, change and supplement
hereto shall be subject to a written agreement executed by the Parties.

 

     

     

    

 

		10.2	Entire contract

 

Except for any written amendment, supplement
or change hereto made after the execution hereof, this Agreement shall constitute the entire agreement among the Parties in respect of
the subject matter hereof, and supersede all prior oral and written negotiation, statements and contracts reached by them with respect
to the subject matter hereof.

 

		10.3	Headings

 

The headings herein are for the convenience
of reading only, and shall not be used for the interpretation or explanation of or in any other respect affecting the meaning of the provisions
hereof.

 

		10.4	Language

 

This Agreement is written in Chinese
in triplicate, with each Party holding one copy respectively, each of which shall have the same legal force and effect.

 

		10.5	Severability

 

Where any provision(s) hereof is/are
determined by any laws or regulations to be void, illegal or unenforceable in any respect, the validity, legality or enforceability of
the remaining provisions hereof shall not be affected or damaged in any respect. The Parties shall endeavor through bona fide negotiation
to replace such void, illegal or unenforceable provision(s) with valid provision(s) to the maximum extent permitted by laws
and expected by the Parties, and the economic effects of such valid provision(s) shall be similar to that of such void, illegal or
unenforceable provision(s).

 

		10.6	Successor

 

This Agreement shall be binding upon
and inure to the benefit of the respective successors of the Parties and the permitted assigns of such Parties.

 

		10.7	Survival

 

		10.7.1	Any obligation arising from this Agreement or becoming due prior to the expiry or early termination hereof
shall survive the expiry or early termination hereof.

 

		10.7.2	The provisions of Articles 5, 7, 8 hereof and this Article 10.7 shall survive the termination hereof.

 

		10.8	Waiver

 

Any Party may waive any terms and conditions
hereof, provided that such waiver shall be made in writing and executed by the Parties. The waiver by any Party under certain circumstances
with respect to other Parties’ breach of contract shall not be deemed as waiver by such Party under other circumstances with respect
to similar breach of contract.

 

[The following is the signature page.]

 

     

     

    

 

In witness whereof, the Parties have caused their
authorized representatives to execute this Exclusive Call Option Agreement on the date first above written for mutual compliance.

 

	Party A: Chema Technology (Beijing) Co., Ltd.	 
	(Seal) Seal of Chema Technology (Beijing) Co., Ltd. Affixed	 
	 	 	 
	Signature:	/s/ Wen
    Wei	 
	Name: Wen Wei	 
	Title: Legal representative	 
	 	 	 
	 	 	 
	Party B:	 	 
	 	 	 
	Signature:	/s/ Wen
    Wei	 
	Name: Wen Wei	 
	 	 	 
	Signature:	/s/ Sun
    Jianchen	 
	Name: Sun Jianchen	 
	 	 	 
	Signature:	/s/ Cheng
    Congwu	 
	Name: Cheng Congwu	 
	 	 	 
	 	 	 
	Party C: Tansuo Jixian Technology (Beijing) Co., Ltd.	 
	(Seal) Seal of Tansuo Jixian Technology (Beijing) Co., Ltd. Affixed	 
	 	 	 
	Signature:	/s/ Wen
    Wei	 
	Name: Wen Wei	 
	Title: Legal representativeExhibit 4.21

 

Equity Pledge Agreement

 

(English Translation)

 

This Equity Pledge Agreement (hereinafter referred
to as this “Agreement”) is executed by and among the following Parties on June 24, 2018 in Beijing:

 

Party A: Chema Technology (Beijing) Co., Ltd.
(hereinafter referred to as the “Pledgee”)

 

	Add.:	931, 9F, 21 Yangfangdian Road, Haidian District, Beijing

 

	Party B: 	
    Wen Wei, a Chinese citizen, ID card number:

    Sun Jianchen, a Chinese citizen, ID card
    number:

    Cheng Congwu, a Chinese citizen, ID card
    number;

    (hereinafter referred to collectively as the “Pledgors”)

 

Party C: Tansuo Jixian Technology (Beijing)
Co., Ltd.,

	Add.:	929, 9F, 21 Yangfangdian Road, Haidian District, Beijing.

 

In this Agreement, the Pledgee, the Pledgors and
Party C are hereinafter each referred to as a “Party” and collectively referred to as the “Parties”.

 

Whereas:

 

		1.	The Pledgors are citizens of the People’s Republic of China (hereinafter referred to as “China”),
holding 100% of the equity of Party C. Party C is a limited liability company registered in Beijing, China, and is engaged in technology
development, service, transfer and consultation; enterprise management consulting; economic and trade consultation; advertisement design,
manufacture and release and advertising agency service; organization of culture and art exchange activities (excluding commercial performances);
organization of exhibitions and shows; and sales of automotive, auto parts, grocery, building materials (non-engagement in operating brick
and mortar stores), chemical products (excluding dangerous chemicals and precursor chemicals in Category I), mechanical equipment, electronic
products, computer, software and auxiliary equipment, household appliances, hardware and electrical equipment (non-engagement in operating
brick and mortar stores or the sale of electronic bike), handicrafts, and needle textile. Party C acknowledges the respective rights and
obligations of the Pledgors and the Pledgee hereunder and agrees to provide any necessary assistance in the registration of such Right
of Pledge;

 

		2.	The Pledgee is a solely foreign-owned enterprise incorporated in Beijing, China. The Pledgee and Party
C executed an Exclusive Business Cooperation Agreement on June 24, 2018; the Pledgee, the Pledgors and Party C executed an Exclusive
Call Option Agreement on June 24, 2018; each Pledgors executed an Power of Attorney on June 24, 2018;

 

     

     

    

 

		3.	In order to ensure that Party C and the Pledgors will perform their obligations under the above Exclusive
Business Cooperation Agreement, the Exclusive Call Option Agreement and the Powers of Attorney, the Pledgors pledge all of the equity
owned by them in Party C to the Pledgee for the performance by Party C and the Pledgors of the Exclusive Business Cooperation Agreement,
the Exclusive Call Option Agreement and the Powers of Attorney.

 

In order to perform the provisions of the above
Transaction Documents, the Parties agree to execute this Agreement in accordance with the following terms.

 

		1.	Definitions

 

Unless otherwise specified herein, the following
words shall have the meanings ascribed to them below:

 

		1.1	“Right of Pledge” shall mean the security interest granted by the Pledgors to the Pledgee
pursuant to Article 2 hereof, i.e., the Pledgee’s right to be paid in priority with the price at which the Equity is transferred,
auctioned or sold.

 

		1.2	“Equity” shall mean 100% of the equity legally held by the Pledgors in Party C, i.e.,
the 77.59% of the equity held by the Pledgor Wen Wei in Party C, the 20% of the equity held by the Pledgor Sun Jianchen in Party C, and
the 2.41% of the equity held by the Pledgor Cheng Congwu in Party C. Such Equity shall include all equity interests currently held by
and hereafter acquired by the Pledgers in Party C.

 

		1.3	“Term of Pledge” shall mean the term provided for in Article 3 hereof.

 

		1.4	“Transaction Documents” shall mean the Exclusive Business Cooperation Agreement executed
by and between the Pledgee and Party C on June 24, 2018; the Exclusive Call Option Agreement executed by and among the Pledgee, the
Pledgors and Party C on June 24, 2018; the Powers of Attorney executed by the Pledgors on June 24, 2018; and any modification,
amendment and/or restatement of such executed documents.

 

		1.5	“Secured Debt” shall mean all direct, indirect and derivative losses and loss of predictable
interests suffered by the Pledgee as a result of any Event of Default by any Pledgor and/or Party C. Basis for the amount of such losses
includes but is not limited to the Pledgee’s reasonable business plan and earnings estimate, fees payable by Party C under the Exclusive
Business Cooperation Agreement, and all costs incurred by the Pledgee to force the Pledgor and/or Party C to perform their obligations
under the Transaction Documents.

 

     

     

    

 

		1.6	“Event of Default” shall mean any circumstance specified in Article 7 hereof.

 

		1.7	“Default Notice” shall mean notice issued by the Pledgee in accordance with this Agreement
to declare any Event of Default.

 

		2.	Right of Pledge
		 	 
		 	As a guarantee for the performance by
Party C and the Pledgors of their obligations under the Transaction Documents, each Pledgor hereby pledges all of the Equity held by it
in Party C to the Pledgee. With the prior written consent of the Pledgee, the Pledgors may increase the capital of Party C. The amount
of additional contribution made by the Pledgors in the registered capital of the company due to capital increase also falls under the
pledged Equity. Where Party C shall be dissolved or liquidated according to the mandatory provisions of Chinese laws, any interests distributed
in accordance with the law from Party C to the Pledgors after the completion of dissolution or liquidation of Party C in accordance with
the law shall be at the request of the Pledgee (i) deposited into an account designated by the Pledgee to be supervised by the Pledgee
and used for securing the obligations under the Transaction Documents and first for paying off the Secured Debts under the Transaction
Documents; or (ii) without violating Chinese laws, unconditionally granted to the Pledgee or any person designated by the Pledgee.

 

		3.	Term of Pledge

 

		3.1	The Right of Pledge shall take effect upon the registration thereof with the administration for industry
and commerce at the place where Party C is located (hereinafter referred to as the “Registration Authority”), and the term
thereof will expire after all obligations under the Transaction Documents are performed and all Secured Debts under the Transaction Documents
are paid off. The Parties agree that on the date of execution hereof, the Pledgor and Party A shall file an application with the Registration
Authority for the registration of the equity pledge in accordance with the Measures for the Registration of Equity Pledge at Administrative
Departments for Industry and Commerce. The Parties further agree that, within twenty (20) working days as of the date of formal acceptance
by the Registration Authority of the application for equity pledge registration, all formalities for equity pledge registration shall
be completed, a registration notice issued by the Registration Authority shall be obtained, and the equity pledge shall be recorded completely
and accurately on the equity pledge register by the Registration Authority.

 

		3.2	The Term of Pledge is 10 years. Where the term of any Transaction Document secured by the Right of Pledge
exceeds the Term of Pledge, the Term of Pledge hereunder shall be extended accordingly. Where during the Term of Pledge, any Pledgor and/or
Party C fail(s) to perform the contractual obligations or pay the Secured Debts under the Transaction Documents, the Pledgee may
but is not obliged to exercise the Right of Pledge in accordance with the provisions hereof.

 

     

     

    

 

		4.	Custody of equity records

 

		4.1	During the Term of Pledge provided for herein, the Pledgors shall deliver within a week upon the execution
hereof the equity contribution certificate and the register of shareholders on which the Right of Pledge is recorded to the Pledgee for
custody. The Pledgee shall keep such documents throughout the Term of Pledge provided for herein.

 

		4.2	During the Term of Pledge, the Pledgee shall have the right to collect the dividends arising from the
Equity. With the prior written consent of the Pledgee, the Pledgors may get dividends or profits in respect of the pledged Equity. The
dividends or profits obtained by the Pledgors due to the pledged Equity shall be, after deductions are made to pay the income tax payable
by the Pledgors, at the request of the Pledgee: (i) deposited into an account designated by the Pledgee to be supervised by the Pledgee
and used for securing the obligations under the Transaction Documents and first for paying off the Secured Debts under the Transaction
Documents; or (ii) without violating Chinese laws, unconditionally granted to the Pledgee or any person designated by the Pledgee.

 

		5.	Representations and Warranties of the Pledgor and Party C

 

		5.1	Each Pledgor is the sole legal and beneficial owner of the Equity. Each Pledgor has the right to dispose
of and transfer the pledged Equity in the manner provided for in this agreement.

 

		5.2	Other than this Right of Pledge, each Pledgor has not placed any security interest or other encumbrances
on the Equity.

 

		5.3	The Pledgors and Party C have obtained the consent and approval of government authorities and third parties
(if required) to execute, deliver and perform this agreement.

 

		5.4	The execution, delivery and performance hereof will not: (i) result in violation of any relevant
Chinese laws; (ii) conflict with Party C’s articles of association or other organizational documents; (iii) result in
violation of or constitute breach of contract under any contract or document to which they are a party or which is binding upon them;
(iv) result in any violation of any condition for the grant and/or continued validity of any license or permit issued to either of
them; or (v) result in the suspension or revocation of or additional conditions for any license or permit issued to either of them;

 

     

     

    

 

		6.	Undertakings and Further Consent of the Pledgor and Party C

 

		6.1	During the term hereof, the Pledgors and Party C hereby jointly and severally undertake to the Pledgee
that:

 

 6.1.1      Except for performing the Transaction Documents, without the prior written consent of the Pledgee, they may not transfer the Equity or place or allow the existence of any security interest or other encumbrances thereon which may affect the rights and interests of the Pledgee in the Equity;

 

 6.1.2      They will forthwith notify the Pledgee of any event or any notice received by the Pledgor which may affect the Pledgee’s right to the Equity or any part thereof and any event or any notice received by the Pledgor which may affect any warranty or other obligations of the Pledgor arising from this Agreement;

 

 6.1.3       Party C shall complete the registration formalities for the extension of business term within three (3) months prior to the expiry of its business term, so as to ensure the continued validity hereof.

 

 6.1.4      Upon the execution hereof, with respect to the Equity of Party C obtained by the Pledgors by making additional capital contribution to Party C, the Pledgors and Party C shall: (I) register the Equity hereunder on Party C’s register of shareholders within 3 working days as of the date of completion of the capital increase; and (II) apply with corresponding administration for industry and commerce for the registration of the Equity hereunder within 45 working days as of the date of completion of the capital increase or transfer.

 

		6.2	Each Pledgor agrees that the right to the Equity obtained by the Pledgee in accordance with this Agreement
may not be interrupted or obstructed by such Pledgor or any successor or representative thereof or any other person through legal procedure.

 

		6.3	Each Pledgor hereby undertakes to the Pledgee that it will comply with and perform all warranties, undertakings,
agreements, statements and conditions hereunder. Where any Pledgor fails to or partially perform its warranties, undertakings agreements,
statements and conditions, such Pledgor shall compensate the Pledgee for all losses resulting therefrom.

 

     

     

    

 

		7.	Event of Default
		 	 
		7.1	Each of the following circumstances shall be deemed as an Event of Default:

 

 7.1.1      Violation by any Pledgor of any of its obligations under the Transaction Documents and/or this Agreement;

 

 7.1.2      Violation by Party C of any of its obligations under the Transaction Documents and/or this Agreement;

 

 7.1.3      Any statement or warranty made by any Pledgor in Article 5 hereof includes gross misrepresentation or error, and/or any Pledgor violates any warranty in Article 5 hereof;

 

 7.1.4      The Pledgors and Party C fail to complete the equity pledge registration with the Registration Authority as provided for in Article 3.1 hereof;

 

 7.1.5      Any Pledgor or Party C violates any provisions hereof;

 

 7.1.6      Unless specified in Article 6.1.1, any Pledgor transfers or intends to transfer or waives the pledged Equity or assigns without the written consent of the Pledgee the pledged Equity;

 

 7.1.7      Any liability of the Pledgor per se for any loan from or any guarantee, compensation, undertaking or other debts to any third party: (i) is required to be repaid or performed in advance due to the Pledgor’s breach of contract; or (ii) has become due but cannot be repaid or performed on time;

 

 7.1.8      Any approval, license, permit or authorization of government authorities which makes this Agreement enforceable, legal and valid is withdrawn or suspended, becomes void, or is changed substantially;

 

 7.1.9      The promulgation of applicable laws which makes this Agreement illegal or makes any Pledgor unable to continue to perform its obligations hereunder;

 

 7.1.10    Any adverse change in the property owned by any Pledgor, causing the Pledgee to deem that such Pledgor’s ability to perform its obligations hereunder is affected;

 

 7.1.11    Party C’s successor or trustee can only partially perform or refuses to perform the payment liabilities under the Transaction Documents; and

 

 7.1.12    Any other circumstances under which the Pledgee is unable or may be unable to exercise its rights to the pledge.

 

     

     

    

 

		7.2	Upon knowing or detecting any circumstance specified in Article 7.1 or the occurrence of any event
which may result in the aforesaid circumstances, the Pledgor shall forthwith notify the Pledgors in writing accordingly.

 

		7.3	Unless the Event of Default specified in this Article 7.1 has been successfully settled to the satisfaction
of the Pledgee, the Pledgee may issue upon or at any time after the occurrence of any Event of Default a Default Notice to any Pledgor,
requesting the latter to forthwith perform its obligations or pay the Secured Debts under the Transaction Documents, and/or dispose of
the pledge in accordance with the provisions of Article 8 hereof.

 

		8.	Exercise of the Right of Pledge

 

		8.1	Without the written consent of the Pledgee, no Pledgor may transfer its Equity in Party C.

 

		8.2	The Pledgee may issue a Default Notice to the Pledgors at the time of exercising the Right of Pledge.

 

		8.3	Subject to the provisions of Article 7.3, the Pledgee may exercise at the time of or at any time
after issuing the Default Notice in accordance with Article 8.2 the right to implement the pledge.

 

		8.4	The Pledgee may be paid in priority in accordance with legal procedures with the price at which all or
part of the Equity pledged hereunder is transferred, auctioned or sold, until the Secured Debts under the Transaction Documents are fully
offset.

 

		8.5	When the Pledgee dispose of the pledge in accordance with this Agreement, the Pledgor and Party C shall
render necessary assistance, so that the Pledgee may exercise the Right of Pledge pursuant to this Agreement.

 

		9.	Transfer

 

		9.1	Without the prior written consent of the Pledgee, the Pledgor may not assign its rights or delegate its
obligations hereunder.

 

		9.2	This Agreement shall be binding upon the Pledgor, and its successors and permitted assignees and shall
be valid for the Pledgor and each of its successors and assigns.

 

     

     

    

 

		9.3	The Pledgee may transfer at any time any and all of its rights and obligations under the Transaction Documents
to any (natural/legal) person designated by it, in which case the transferee shall enjoy the rights and bear the obligations of the Pledgee
hereunder, as if it were an original party hereto. When the Pledgee transfers any of its rights and obligations under the Transaction
Documents, at the request of the Pledgee, the Pledgor shall execute relevant agreements or other documents in relation to such transfer.

 

		9.4	Where the Pledgee is changed as a result of the transfer, at the request of the Pledgee, the Pledgor shall
execute with the new Pledgee a new pledge agreement with the same terms and conditions as that of this Agreement.

 

		9.5	The Pledgor shall strictly comply with the provisions of this Agreement and other contracts or documents
executed jointly or separately by the Parties or any Party, including the Exclusive Call Option Agreement and the Powers of Attorney granted
to the Pledgee, perform its obligations under this Agreement and other contracts, and not engage in any act/omission that may affect the
validity and enforceability thereof. Unless instructed by the Pledgee in writing, the Pledgor may not exercise any residual right to the
Equity pledged hereunder.

 

		10.	Termination

 

		 	Unless otherwise provided for by the law, neither any Pledgor nor Party C has in any case any right to terminate or dissolve this Agreement. After the Pledgor and Party C have fully and completely performed all of their contractual obligations and paid off all Secured Debts under the Transaction Documents, the Pledgee shall, at the request of the Pledgor, as soon as reasonably practicable, rescind the pledge of the pledged Equity hereunder, and cooperate with the Pledgor to handle formalities for cancelling the registration of Equity pledge in Party C’s register of shareholders and for cancelling the registration of pledge with relevant administration for industry and commerce.

 

		11.	Commission and other Fees

 

		 	All fees and actual expenditures in relation to this Agreement, including but not limited to the lawyer’s fee, cost of production, stamp duty, and any other taxes and costs shall be borne by Party C. Where any applicable law requires that the Pledgee shall bear some relevant taxes and fees, the Pledgors shall cause Party C to repay in full the taxes and fees that have been paid by the Pledgee.

 

     

     

    

 

		12.	Confidentiality Liability

 

		 	The Parties acknowledge that any oral or written information exchanged in respect hereof shall be confidential information. Each Party shall keep confidential all such information and, without the written consent of the other Parties, may not disclose to any third party any relevant information, unless: (a) the public is or will be aware of such information (which is not caused by any disclosure by the receiving Party to the public); (b) such information shall be disclosed as required by applicable laws or the rules or provisions of any securities exchange; (c) any Party is required to disclose such information to its legal consultant or financial consultant with respect to any transaction provided for hereunder, and such legal consultant or financial consultant is also required to be bound by confidentiality obligation similar to that provided for in this clause. The disclosure of any confidential information by any staff or organization employed by any Party shall be deemed as disclosure of such confidential information by such Party, and such Party shall bear legal liability for its violation hereof. This clause shall survive the termination hereof for whatever reason.

 

		13.	Applicable Laws and Dispute
Settlement

 

		13.1	The execution, effectiveness, interpretation and performance hereof and the settlement of disputes hereunder
shall be governed by laws formally promulgated and publicly available in China. Anything not covered by such laws shall be governed by
international legal principles and practices.

 

		13.2	Any dispute arising from the interpretation and performance hereof shall be settled by the Parties through
friendly negotiation first. Where the Parties fail to reach any agreement on the settlement of such dispute within 30 days after a request
for settlement of the dispute through negotiation is made by any Party to the other Parties, any Party may submit the dispute to China
International Economic and Trade Arbitration Commission for settlement in accordance with its then effective arbitration rules. The arbitration
shall be held in Beijing, and the language of the arbitration shall be Chinese. The arbitration award shall be final and binding upon
the Parties.

 

		13.3	Where any dispute arises from the interpretation and performance hereof, or during the period when any
dispute is subject to arbitration, except for the matters under dispute, the Parties shall continue to exercise their respective rights
and perform their respective obligations hereunder.

 

		14.	Notice

 

		14.1	All notices and other communications to be sent as required or permitted hereunder shall be sent by personal
delivery or postage prepaid registered mail, commercial courier service or fax to the address of the receiving Party. For each notice,
a confirmation letter shall be sent via email. Such notice shall be deemed effectively delivered on:

 

     

     

    

 

 14.1.1    the date of delivery or rejection at the designated receiving address, if sent by personal delivery, courier service or postage prepaid registered mail; or

 

 14.1.2    the date of successful transmission (evidenced by an automatically generated message confirming the transmission), if sent by fax.

 

		14.2	For the purpose of notice, the Parties’ addresses are as follows:

 

Party A: Chema
Technology (Beijing) Co., Ltd.

Add: 931, 9F, 21
Yangfangdian Road, Haidian District, Beijing

Attn: Wen Wei

Tel: 010-6396066

Fax: N/A

 

Part B: Wen
Wei, Sun Jianchen

 

Add: [ ]

Attn: [ ]

Tel: [ ]

 Fax: [ ]

 

Party B: Cheng
Congwu

 

Add: [ ]

Attn: [ ]

Tel: [ ]

 Fax: [ ]

 

Party C: Tansuo
Jixian Technology (Beijing) Co., Ltd.

Add: 929, 9F, 21
Yangfangdian Road, Haidian District, Beijing

Attn: Wen Wei

Tel: 010-6396066,
4006969123

Fax: 010-6396066

 

		14.3	Any Party may change at any time its address for the receipt of notices by notifying the other Parties
in accordance with the terms of this clause.

 

		15.	Severability
		 	 
		 	Where any provision(s) hereof is/are determined by any laws or regulations to be void, illegal or unenforceable in any respect, the validity, legality or enforceability of the remaining provisions hereof shall not be affected or damaged in any respect. The Parties shall endeavor through bona fide negotiation to replace such void, illegal or unenforceable provision(s) with valid provision(s) to the maximum extent permitted by laws and expected by the Parties, and the economic effects of such valid provision(s) shall be similar to that of such void, illegal or unenforceable provision(s).

 

     

     

    

 

		16.	Appendix
		 	 
			The appendixes listed herein shall be
an integral part hereof.

 

		17.	Effectiveness

 

		17.1	This Agreement shall take effect on the date of execution hereof by the Parties. Any and all amendments,
modifications and supplements hereto shall be made in writing and take effect after the signature or seal of the Parties and the completion
of government registration procedures (if applicable).

 

		17.2	This Agreement is written in Chinese in triplicate, with the Pledgors, the Pledgee and Party C each holding
one copy respectively, each of which shall have the same legal force and effect.

 

[The following is the signature page.]

 

     

     

    

 

In witness whereof, the Parties have caused their
authorized representatives to execute this Equity Pledge Agreement on the date first above written for mutual compliance.

 

Party A: Chema Technology (Beijing) Co., Ltd.

(Seal) Seal of Chema Technology (Beijing) Co., Ltd.
Affixed

 

	Signature:	/s/ Wen Wei	 
	Name: Wen Wei
	Title: Legal representative

 

Party B:

 

	Signature:	/s/ Wen Wei	 
	Name: Wen Wei

 

	Signature:	 /s/ Sun Jianchen	 
	Name: Sun Jianchen

 

	Signature:	 /s/ Cheng Congwu	 
	Name: Cheng Congwu

 

Party C: Tansuo Jixian Technology (Beijing)
Co., Ltd.

(Seal) Seal of Tansuo Jixian Technology (Beijing)
Co., Ltd. Affixed

 

	Signature:	/s/ Wen Wei	 

Name: Wen Wei

Title: Legal representative

 

     

     

    

 

Appendixes:

 

1.     Capital
Contribution Certificate

 

2       Register
of Shareholders of Tansuo Jixian Technology (Beijing) Co., Ltd.

 

     

     

    

 

Appendix I

 

Capital Contribution Certificate

 

This is to certify that Wen Wei (ID card number:                                                   
) holds RMB 3,879,500 in the registered capital of Tansuo Jixian Technology (Beijing) Co., Ltd., accounting for 77.59% of the equity
thereof, and that such 77.59% of the equity has all been pledged to Chema Technology (Beijing) Co., Ltd..

 

 

Company: Tansuo Jixian Technology (Beijing) Co., Ltd.

(Seal) Seal of Tansuo Jixian Technology (Beijing)
Co., Ltd. Affixed

 

	 	Signature:	/s/ Wen Wei
	 	Name: Wen Wei
	 	Title: Legal representative
	 	 
	 	June 24, 2018

 

     

     

    

 

Appendix I

 

Capital Contribution Certificate

 

This is to certify that Sun Jianchen (ID card
number:                                                   
 ) holds RMB 1,000,000 in the registered capital of Tansuo Jixian Technology (Beijing) Co., Ltd., accounting for 20% of the
equity thereof, and that such 20% of the equity has all been pledged to Chema Technology (Beijing) Co., Ltd..

 

 

Company: Tansuo Jixian Technology (Beijing) Co., Ltd.

(Seal) Seal of Tansuo Jixian Technology (Beijing)
Co., Ltd. Affixed

 

	 	Signature:	 /s/ Wen Wei
	 	Name: Wen Wei
	 	Title: Legal representative
	 	 
	 	June 24, 2018

 

     

     

    

 

Appendix I

 

Capital Contribution Certificate

 

This is to certify that Cheng Congwu (ID card
number:                                                   
  ) holds RMB 120,500 in the registered capital of Tansuo Jixian Technology (Beijing) Co., Ltd., accounting for 2.41% of the
equity thereof, and that such 2.41% of the equity has all been pledged to Chema Technology (Beijing) Co., Ltd..

 

 

Company: Tansuo Jixian Technology (Beijing) Co., Ltd.

(Seal) Seal of Tansuo Jixian Technology (Beijing)
Co., Ltd. Affixed

 

	 	Signature:	/s/ Wen
    Wei
	 	Name: Wen Wei
	 	Title: Legal representative
	 	 
	 	June 24, 2018

 

     

     

    

 

Appendix II

 

Register of Shareholders of Tansuo Jixian Technology
(Beijing) Co., Ltd.

 

	Name of

 Shareholder	 	Unified Social 

Credit Code/ID 

Card Number	 	Amount of Contribution(RMB)	 	Ratio of 

Contribution	 	 	Equity Pledge
	Wen Wei	 	/	 	3,879,500	 	77.59	%	 	Wen Wei owns 77.59% of the equity of Tansuo Jixian Technology (Beijing) Co., Ltd., and such 77.59% of the equity has all been pledged to Chema Technology (Beijing) Co., Ltd..
	Sun Jianchen	 	/	 	1,000,000	 	20	%	 	Sun Jianchen owns 20% of the equity of Tansuo Jixian Technology (Beijing) Co., Ltd., and such 20% of the equity has all been pledged to Chema Technology (Beijing) Co., Ltd..
	Cheng Congwu	 	/	 	120,500	 	2.41	%	 	Cheng Congwu owns 2.41% of the equity of Tansuo Jixian Technology (Beijing) Co., Ltd., and such 2.41% of the equity has all been pledged to Chema Technology (Beijing) Co., Ltd..

 

	 	Company: Tansuo Jixian Technology (Beijing) Co., Ltd.
	 	(Seal) Seal of Tansuo Jixian Technology (Beijing) Co., Ltd. Affixed
	 	 
	 	Signature:	 /s/ Wen Wei
	 	Name: Wen Wei
	 	Title: Legal representative

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