system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
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lawyers and witnesses. 17. Notices. Any notice required or permitted to be given hereunder shall be deemed to have been duly given if delivered by hand, overnight courier delivery or mailed, certified and registered mail, with postage prepaid to the addresses first set forth above or at such other addresses as either party may designate in writing to the other, and if to ALFA AESAR with a copy to Johnson Matthey, 435 Devon Park, Suite 600. Wayne PA 19087, Attention: Vice President & General Counsel. This section is not intended to govern the day-to-day business communications necessary between the parties in performing their duties, in due course, under the terms of this Agreement. 18. Severability. The provisions of this agreement shall be severable, and if any provision of this Agreement is held to be invalid or unenforceable, it shall be construed to have the broadest interpretation which would render it valid and enforceable. Invalidity or unenforceability of one provision shall not affect any other provision of this Agreement. 19. Entire Agreement. This Agreement contains the entire agreement with respect to the subject matter hereof, and there are no other agreements or understandings, express or implied, written or oral, as to the subject matter hereof. This Agreement may not be amended or altered except by a written instrument signed by both parties, expressly stating that it is intended as an amendment hereto. No purchase order or other written order or acknowledgment issued by either party shall serve to vary the terms and conditions of this Agreement, or otherwise alter the obligations of the parties provided herein. 20. Waiver. The waiver by either party of any breach or failure to enforce any of the terms and conditions of this Agreement at any time shall not in any way affect, limit or waive either party's rights thereafter to enforce and compel strict compliance with every term and condition of this Agreement. 21. Counterparts. This Agreement may be executed in one or more counterpart copies, each of which shall be deemed an original and all of which shall together be deemed to constitute one agreement. 22. Governing Law. This Agreement shall be governed by and interpreted under and in accordance with the laws of the State of Delaware without regard to principles of conflicts of laws. 10 23. Public Announcements. Upon execution and at any time during the term of this Agreement, the parties shall cooperate in preparing a joint press release announcing this Agreement and the availability of NTC Products in Research Quantities through ALFA AESAR, provided that no such joint press release shall be issued without both parties' prior approval. 24. Headings. The headings in this Agreement are for convenience only and do not in any way limit or amplify the terms or conditions of this Agreement. IN WITNESS WHEREOF, the parties have duly executed this Agreement as of the date first set forth above. NANOPHASE TECHNOLOGIES CORPORATION JOHNSON MATTHEY CATALOG COMPANY, INC. By: /s/ W. Ian Roberts By: /s/ Barry Singelais W. Ian Roberts Barry Singelais V.P. U.S. & International Sales General Manager Dated: October 14, 2005 Dated: October 24, 2005 11 Schedule A List of Products to be offered by ALFA AESAR. Quantities and NTC pricing to ALFA AESAR are included. All prices are USD, FOB Romeoville IL, net 30. Product Specification Nanopowders: Name Product Code Quantity Price/kg NanoTek® Aluminum Oxide 0115 [***] $[***] NanoDur™ Aluminum Oxide 0119 [***] $[***] NanoTek® Antimony Tin Oxide 2400 [***] $[***] NanoArc® Bismuth Oxide EXP 0250 [***] $[***] NanoArc® Copper Oxide EXP 0502 [***] $[***] NanoTek® Indium Tin Oxide 0600 [***] $[***] NanoArc® Cosmetic Iron Oxide EXP 0807 [***] $[***] NanoArc® Magnetic Iron Oxide EXP 0806 [***] $[***] NanoTek® Tin Oxide 1400 [***] $[***] NanoGard® Zinc Oxide 1700 [***] $[***] NanoTek® Zinc Oxide 1701 [***] $[***] NanoTek® Zinc Oxide C1 1716 [***] $[***] NanoTek® Zinc Oxide C2 EXP 1726 [***] $[***] Nanoparticle dispersions: Name Product Code Quantity Price/kg NanoDur™ X1121W, 50wt% EXP 0187 [***] $[***] NanoDur™ X1130PMA, 50wt% EXP 0151 [***] $[***] NanoShield® ZN-2000, 50wt% EXP 1754 [***] $[***] NanoShield® ZN-3010, 50wt% EXP 1769 [***] $[***] NanoTek® Z1102PMA, 50wt% EXP 1707 [***] $[***] NanoTek® AL-6081, 23wt% EXP 0180 [***] $[***] NanoTek® AL-6051, 23 wt% EXP 0142 [***] $[***] NanoTek® CE-6042, 18wt% 0311 [***] $[***] NanoTek® CE-6080, 20wt% 0315 [***] $[***] NanoTek® CE-6082, 18wt% 0314 [***] $[***] NanoTek® CE-6086, 18wt% EXP 0333 [***] $[***] *** CONFIDENTIAL TREATMENT REQUESTED—This confidential portion has been omitted from this document and filed separately with the Commission. 12 Schedule B
"""

Extract the exact clause related to "Parties" from the excerpt above.

assistant: JOHNSON MATTHEY CATALOG COMPANY, INC.