(1,4-Bis(3,4,5-trimethoxybenzoyl)-2-piperazinyl)methyl 2-ethylbutanoate 129229-96-5 Butanoic acid, 2-ethyl-, (1,4-bis(3,4,5-trimethoxybenzoyl)-2-piperazinyl)methyl ester N,N'-Di-(3',4',5'-trimethoxybenzoyl)-2-(2'-ethyl)butanoyloxymethylpiperazine