definiens: shall mean that Biontech or any of its 21Collaboration and License AgreementMain Body Affiliates may not Commercialize a Biontech Non - Field Mixture or enter into any arrangement with any Third Party to Commercialize aBiontech Non - Field Mixture without having first complied with the provisions of this Section 4.2.2 . Any such option shall be exercised bySanofi in writing within [ * * * ] upon [COMPANY] ’s receipt of Biontech ’s respective notice as indicated in ( a ) and ( b ) above . Subject to the provisionsof Section 4.6 below, Biontech shall be free to conduct Development or Commercialization of any Biontech Non - Field Mixture without anyfurther option rights of [COMPANY] after [COMPANY] has finally declined or failed to exercise its two- step option according to the foregoing terms andconditions