ECHA | Swords Laboratories Opinion Adopted for 4-(1,1,3,3-tetramethylbutyl)phenol, ethoxylated



Broad information on use applied for: 4-tert-OPnEO is used in the manufacturing process for the Applicant’s Biological Drug Substance (BDS) abatacept. 4-tert-OPnEO is used for viral inactivation to ensure safety of the final drug substance as per regulatory guidelines. The Applicant is progressing R&D studies to find an alternative to 4-tert-OPnEO that is an effective viral inactivation agent that does not impact the quality of abatacept.

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