19885-52-0 8H,15H-Epidithio-7H,14H-oxepino(3'',4'':4',5')pyrrolo(1,2':4,5)pyrazino(1,2-a)indole-7,14-dione, 5,5a,12,12a-tetrahydro-5,12-dihydroxy-, 5-acetate A-21101-IV Antibiotic A 21101-IV Apoarantoin BRN 5414857