Wiktionary
duocarmycin
n. Any of a series of related natural products isolated from ''Streptomyces'' bacteria, with potent antitumor properties.
Wikipedia
Duocarmycin
The duocarmycins are members of a series of related natural products first isolated from Streptomyces bacteria in 1988. They are notable for their extreme cytotoxicity and thus represent a class of exceptionally potent antitumour antibiotics.