FD 891

Formula :
CAS : 142383-53-7 

An 18-membered macrolide with an epoxide ring at C8 and C9; the epoxide may play an important role in its cytocidal activity.

FD 892

Formula :
CAS : 145177-62-4 

An 18-membered macrolide; from the fermentation broth of Streptomyces graminofaciens A-8890.