A 201A

Formula : C37-H50-N6-O14
CAS : 37305-78-5 

From Streptomyces capreolus.

A 204

Formula :
CAS : 12750-79-7 

Polyether monocarboxylic acid antibiotic; crystalline isolate from fermentation of strain of Streptomyces albus.

A 20832

Formula : C10-H14-Cl2-O3
CAS : 40526-96-3 

Inhibits resolvase-promoted site-specific recombination postsynaptically at strand cleavage.

A 25822

Formula :
CAS : 55187-53-6 

Aza-steroidal antifungal antibiotic complex produced by Geotrichum flavo-brunneum; major component A25822B is 15-aza-24-methylene-D-homocholestadiene; six minor components are structurally related & active against fungi.

A 269A

Formula : C17-H29-N7-O8
CAS : 38621-52-2 

Believed to be the same as LL-BL 136; isolated from broth of Streptomyces sp., strain No. A-269A.

A 274

Formula : C19-H14-O2
CAS : 77273-75-7 

Highly aromatic, monosubstituted phenol antioxidant generated during differentiation of neuroblastoma cells; partial structure known.