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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Party that materially affects the Party's performance of its obligations, except payment obligations, under this Agreement, including embargoes; war or acts of war, including terrorism; insurrections, riots, or civil unrest; strikes, lockouts or other labor disturbances; epidemics, fire, floods, earthquakes, tsunamis, hurricanes or other acts of nature; or acts, omissions or delays in acting by any Governmental Authority (including the refusal of the competent Governmental Authorities to issue required Regulatory Approvals due to reasons other than the affected Party's negligence or willful misconduct or any other cause within the reasonable control of the affected Party) and failure of plant or machinery (provided that such event or failure could not have been prevented by the exercise of skill, diligence, and prudence that would be reasonably and ordinarily expected from a skilled and experienced person engaged in the same type of undertaking under the same or similar circumstances). 1.54 "GAAP" means generally accepted accounting principles current in the U.S. Source: CYTODYN INC., 10-Q, 1/9/2020 1.55 "GCP" means the then-current standards, practices and procedures promulgated or endorsed by the FDA as set forth in the guideline adopted by the International Conference on Harmonization ("ICH"), titled "Guidance for Industry E6 Good Clinical Practice: Consolidated Guidance," (or any successor document) including related regulatory requirements imposed by the FDA, as they may be updated from time to time. 1.56 "GLP" means the then-current standards, practices and procedures promulgated or endorsed by the FDA as set forth in 21 C.F.R. Part 58 (or any successor statute or regulation), including related regulatory requirements imposed by the FDA, as they may be updated from time to time, including applicable guidelines promulgated under the ICH. 1.57 "GMP" means the then-current good manufacturing practices required by the FDA, as set forth in the FDCA, as amended, and the regulations promulgated thereunder, for the manufacture and testing of pharmaceutical materials. 1.58 "Governmental Authority" means any multi-national, national, federal, state, local, municipal or other government authority of any nature (including any governmental division, subdivision, department, instrumentality, agency, bureau, branch, office, commission, council, court or other tribunal). 1.59 "HIV" has the meaning set forth in the Recitals to this Agreement. 1.60 "Indemnifying Party" has the meaning set forth in Section 13.3(a). 1.61 "Indemnitee" has the meaning set forth in Section 13.3(a). 1.62 "Initial Indication" means use in combination with other antiretroviral agents for treatment experienced HIV-1 patients infected exclusively by CCR5- tropic virus, who are failing their current regimen and have documented multi-antiretroviral class resistance to at least one ART drug within 3 drug classes (or within 2 drug classes with limited treatment options). 1.63 "Inventions" means any and all inventions, discoveries and developments, whether or not patentable, which are conceived and reduced to practice relating to the Licensed Product in the Field after the Effective Date and arising in the course of activities under this Agreement: (a) solely by one or more employees or consultants of CytoDyn; (b) solely by one or more employees or consultants of Vyera; or (c) jointly by one or more employees or consultants of CytoDyn and one or more employees or consultants of Vyera. To be clear, Inventions, as defined here, does not include CytoDyn Patents that exist as of the Effective Date. 1.64 "JC" has the meaning set forth in Section 3.1(a). 1.65 "Know-How" means all non-public or proprietary information now known or hereafter developed and disclosed in connection with the activities contemplated by this Agreement, including information applicable to compounds, formulations, compositions, products or to their manufacture, development, registration, use or commercialization or methods of assaying or testing them or processes for their manufacture, formulations containing them, compositions incorporating or comprising them and including all biological, chemical, pharmacological, biochemical, toxicological, pharmaceutical, physical and analytical, safety, quality control, manufacturing, preclinical and clinical data, instructions, processes, formulae, expertise and information, regulatory filings and copies thereof, relevant to the development, manufacture, use or commercialization of and/or which may be useful in studying, testing, development, production or formulation of products, or intermediates for the synthesis thereof. Source: CYTODYN INC., 10-Q, 1/9/2020 1.66 "Knowledge" means, (a) with respect to CytoDyn, the actual knowledge (following due inquiry) of Nader Z. Pourhassan, Michael D. Mulholland, Nitya G. Ray, and Brendan Rae, and (b) with respect to Vyera, the actual knowledge (following due inquiry) of Averill L. Powers, Ruchin Patel, Nicholas J. Pelliccione and Anne K. Kirby. 1.67 "[***]" has the meaning set forth in [***]. 1.68 "[***]" has the meaning set forth in [***]. 1.69 "Liability" or "Liabilities" means losses, damages, fees, costs
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Extract the exact clause related to "Parties" from the excerpt above.

assistant: Vyera