Maytansine Impurity 3

Chemical Name: (14S,16S,32S,33S,2R,4S,10E,12E,14R)-86-chloro-14-hydroxy-85,14-dimethoxy-33,2,7,10-tetramethyl-12,6-dioxo-7-aza-1(6,4)-oxazinana-3(2,3)-oxirana-8(1,3)-benzenacyclotetradecaphane-10,12-dien-4-yl N-(3-mercaptopropanoyl)-N-methyl-D-alaninate

Smile: COC1=CC(C/C(C)=C/C=C/[C@@]([H])(OC)[C@@](NC2=O)(O)C[C@@](O2)([H])[C@@H](C)[C@H](O3)[C@]3(C)[C@@]([H])(OC([C@@H](C)N(C)C(CCS)=O)=O)CC4=O)=CC(N4C)=C1Cl