A fungal metabolite which is a macrocyclic lactone exhibiting a wide range of antibiotic activity.

Synonyms: 0, Cyanein, NSC89671, Synergisidin, Decumbin, Ascotoxin, NSC-89671, 20350-15-6, Brefeldin A, NSC 89671, 4H-Cyclopent(f)oxacyclotridecin-4-one,1,6,7,8,9,11a-beta,12,13,14,14a-alpha-decahydro-1-beta-13-alpha-dihydroxy-6-beta-methyl-