(1,4-Bis(3,4,5-trimethoxybenzoyl)-2-piperazinyl)methyl 3,3-dimethylbutanoate 129229-99-8 Butanoic acid, 3,3-dimethyl-, (1,4-bis(3,4,5-trimethoxybenzoyl)-2-piperazinyl)methyl ester N,N'-Di-(3',4',5'-trimethoxybenzoyl)-2-tert-butyl acetyloxymethylpiperazine