132609-35-9 133021-37-1 4H-Anthra(1,2-b)pyran-5-acetic acid, 7,12-dihydro-8,11-dihydroxy-2-(2-methyl-3-(1-propenyl)oxiranyl)-4,7,12-trioxo-, (2-alpha,3-alpha(Z))-(+)- Antibiotic DC 116 Sapurimycin