Photoresist Chemicals Yohimban-16-carboxylicacid, 17-hydroxy-18-[(3,4,5-trimethoxybenzoyl)oxy]-, methyl ester, monohydrate,(3b,16b,17a,18b,20a)- (9CI) Cas：6105-85-7 Molecular Formula：C31H36 N2 O8 . H2 O