4,24-Dioxa-9,22-diazatetracyclo(19.3.1.1(10,14).0(3,5))hexacosane, maytansine deriv. 88147-94-8 B820915K186 Maytansine, N(2')-deacetyl-22-demethyl-15-methoxy-N(2')-(2-methyl-1-oxopropyl)- Maytansine, N2'-deacetyl-22-demethyl-15-methoxy-N2'-(2-methyl-1-oxopropyl)- NSC354645 Nortrewiasine TREWIASINE, NOR (B820915K186)