Photoresist Chemicals Yohimban-16-carboxylicacid, 11,17-dimethoxy-18-[(3,4,5-trimethoxybenzoyl)oxy]-, methyl ester, (3b,16a,17b,18b,20a)- (9CI) Cas：6872-69-1 Molecular Formula：C33H40 N2 O9