2,3-Bis[[3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadien-1-ylidene]methyl]-butanedioic acid 1,4-dimethyl ester This is a metabolite derived from METILOXTM which is widely used as a phenolic antioxidant. METILOXTM metabolises probably by oxidative dimerisation to this compound found in river sediment. CoA UN207 MSDS UN207