Letter: Novel maytansinoids. Naturally occurring and synthetic antileukemic esters of maytansinol.
D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000302:isolation & purification*; D004952:Esters / Q000302:isolation & purification; D009025:Morpholines / Q000138:chemical synthesis / Q000302:isolation & purification*
D000970:Antineoplastic Agents; D004952:Esters; D009025:Morpholines