Wiktionary
maitansine
n. (alternative form of maytansine English)
Wikipedia
Maitansine
Maitansine ( INN), or maytansine ( USAN), is a cytotoxic agent. It inhibits the assembly of microtubules by binding to tubulin at the rhizoxin binding site.
It is a macrolide of the ansamycin type and can be isolated from plants of the genus Maytenus.
Derivatives are known as maytansinoids.