((Trimethoxy-3',4',5' cinnamoyl)-4 piperazinyl)-2 acetate d'ethyle (maleate) [French] 1-Piperazineacetic acid, 4-(3,4,5-trimethoxycinnamoyl)-, ethyl ester, maleate 23887-41-4 24536-75-2 4-(3,4,5-Trimethoxycinnamoyl)-1-piperazineacetic acid ethyl ester maleate