definiens: means Know - How ( a ) that is Controlled by Mersana or any Affiliate of M ersana as of the Effective Date or at any time during the Term, incl uding pursuant to Section 8.2.1, and any Know - How that is invented, c onceived, or developed ( A ) by either or both Parties, or its or their Affiliates or Third Parties acting on its or their behalf, in eac h case in the course of conducting its or their activities under this Ag reement or ( B ) by or on behalf of any Sublicensee in the course of co nducting activities under a permitted sublicense hereunder, and ( b ) to the extent relating to or consisting of ( i ) a Mersana Cytotoxic Compound, ( ii ) [ * * * ], ( iii ) the conjugation of a Mersana Cytotoxic Compound to a linker, ( iv ) the conjugation of a pharmaceutical compound to a Linker, ( v ) [ * * * ], 9 [ * * * ] Portions of this exhibit have been redacted p ursuant to a confidential treatment request . An unredacted version of this exhibit has been filed s eparately with the Commission