Maytansine Impurity 4

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-((1-ethyl-2,5-dioxopyrrolidin-3-yl)thio)propanoyl)-N-methyl-L-alaninate

Smile: C/C(CC1=CC(N2C)=C(Cl)C(OC)=C1)=C\C=C\[C@@H](OC)[C@@](NC3=O)(O)C[C@@](O3)([H])[C@@H](C)[C@@]4([H])[C@](O4)(C)[C@@H](OC([C@H](C)N(C)C(CCSC5C(N(CC)C(C5)=O)=O)=O)=O)CC2=O