SF-1961, a new antibiotic related to bleomycin.

Shomura T, Omoto S, Ohba K, Ogino H, Kojima M, Inouye S

J Antibiot (Tokyo). 1980 Nov;33(11):1243-8. doi: 10.7164/antibiotics.33.1243.

A new type of bleomycin group antibiotic, SF-1961 was isolated from the fermentation broth of Streptomyces species. SF-1961 possessed beta-amino-beta-(4-amino-6-carboxypyrimidin-2-yl)-propionic acid instead of its 5-methyl derivative which was a common component of bleomycins and phleomycins.