definiens: means an agreement between Mersana or an Affiliate of Mersana and a Third Party, entered int o after the Effective Date, pursuant to which Mersa na has, but for the second proviso of this Section 1.1.46, acqu ired Control of certain Mersana Technology or Mersa na Platform Technology ; provided that such agreement will not be deemed to be a Fut ure Mersana In - License unless and until the Parties have agreed upon the e conomic terms pursuant to which [COMPANY] may access su ch Mersana Technology or Mersana Platform Technology p ursuant to Section 6.3.4.2(b ) ; and provided further that such Mersana Technology or Mersana Platform Technol ogy will not be deemed to be in the of 6 [ * * * ] 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