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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quarter will be subject to a true-up process which will occur by the 15th of the second month of the following quarter. By way of example, Promotion Fees for each of the months of April, May and June will be settled using the Gross Margin Per Tablet amount that has been calculated for the quarter ended March 31 and will be subject to a true-up process to occur by August 15 with any adjustment to such Promotion Fees being settled between the parties within 15 days thereafter. 5.4 In the event MBRK shall discontinue detailing prescribers in a territory that is not included in the then current DD Target Segment Prescribers set forth in EXHIBIT 1 to this Agreement or any amendments thereto ("New DD Target Segment Prescribers"), the Parties shall negotiate in good faith the Promotion Fee payable to DD should MBRK desire that DD add those New DD Target Segment Prescribers to the DD Target Segment Prescribers. 5.5. The Promotion Fees shall be paid to DD by MBRK fifteen (15) days after the receipt of an invoice from DD by MBRK. 5. 6. The basis for determining the Promotion Fees will be the Prescriber Data provided by MBRK to DD. 5.7. DD agrees to submit invoices to MBRK at the following address: Attn: Accounts Payable MiddleBrook Pharmaceuticals, Inc. 7 Village Circle, Suite 100 Westlake, TX 76262 (A)= Actual DD Target Segment MOXATAG TRx (5,000) x an average tablet amount for the month of (9.8 tablets)= 49,000 (B)= 3.65 (C)= 50% Section 6 — Obligations of MBRK 6.1. Subject to the terms of confidentiality set forth in Section 10, MBRK agrees to make available to DD to the best of its ability the items as stipulated in EXHIBIT 2. These items include the relevant portions of its marketing and communications plan, approved sales promotion materials in electronic format where available, sales and training aids relevant to MOXATAG and promotional items and packages for appropriate licensed physicians, nurses, nurse practitioners and physician assistants. Additionally, MBRK or its authorized designee shall be responsible for the provision of MOXATAG samples in response to a prescriber's request as documented on a Sample Request Form and MBRK or its authorized vendor shall be solely responsible for sample fulfillment in quantities agreed to by MBRK. At no time shall DD take physical possession of or title to MOXATAG samples. 6.2. Notwithstanding any other provision of this Agreement, MBRK shall have the sole right and authority and in its sole discretion shall take any actions that it deems appropriate with respect to MOXATAG as would normally be done in accordance with accepted business practices and federal and state legal requirements to maintain the authorization and/or ability to market MOXATAG in the US, including, without limitation, the following: (a) manufacturing, storage, and distribution of MOXATAG trade and sample product; (b) the scope and strategies with respect to the marketing and promotion of MOXATAG, including, without limitation, any labeling or claims in connection therewith; (c) booking sales and distribution of MOXATAG hereunder and performance of related services; (d) handling all aspects of order processing, invoicing and collection, inventory and receivables; (e) providing customer support, including handling medical queries, and performing other functions consistent with consumer practice for prescription pharmaceuticals; (f) responding to product and medical complaints relating to MOXATAG; (g) handling all returns of MOXATAG trade and sample product; (h) handling all voluntary recalls and market withdrawals of MOXATAG. In such a situation, DD will make available to MBRK, upon request, all of DD's pertinent records on MOXATAG. Any and all reasonable and documented costs and expenses incurred by DD in the conduct of any such recall or market withdrawal of MOXATAG shall be reimbursed by MBRK, except to the extent such recall or market withdrawal was the direct result of the negligence or failure of DD to comply with its obligations under this Agreement; (i) communicating with any governmental agencies and satisfying their requirements regarding all regulatory approvals of MOXATAG; including the filing of marketing and promotion materials approved by MBRK under this Agreement with the FDA in compliance with all FDA pharmaceutical marketing regulations; (j) reporting adverse reaction reports to US regulatory authorities as required by applicable US law or regulation; 6.3 Notwithstanding any other provision herein to the contrary, MBRK shall have the sole right and responsibility for establishing and modifying the terms and conditions with respect to the sale of MOXATAG, including, without limitation, the price at which MOXATAG will be sold, any discounts
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Extract the exact clause related to "Parties" from the excerpt above.

assistant: MBRK