Is Butanoic acid, 3-mercapto-, 1,1'-[2,2-bis[(3-mercapto-1-oxobutoxy)methyl]-1,3-propanediyl] ester vegan?

Pentaerythrityl Tetramercaptobutyrate is also known as Butanoic acid, 3-mercapto-, 1,1'-[2,2-bis[(3-mercapto-1-oxobutoxy)methyl]-1,3-propanediyl] ester.

Pentaerythrityl Tetramercaptobutyrate is a synthetic ester of pentaerythritol and mercaptobutyric acid, used as a crosslinking or chain-transfer agent in cosmetic and polymer applications.

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