110200-30-1 Antibiotic SF2415B2 Naphth(2,3-b)oxirene-2,7-dione, 7a-(3,7-dimethyl-2,6-octadienyl)-1a,7a-dihydro-3,5-dihydroxy-4-methyl-1a-(3-methyl-2-butenyl)-, (1a-alpha,7a-alpha(E))-(+)-