74516-67-9 NSC319081 RORIDIN A B-9,10-EPOXIDE Spiro(3,5-methano-14H,20H,21H-oxireno[h][1,6,12]trioxacyclooctadecino[3,4-d][1]benzopyran-4(3H),2'-oxirane), verrucarin A deriv. Verrucarin A, 7'-deoxo-9,10-epoxy-9,10-dihydro-7'-(1-hydroxyethyl)-, (9.beta.,10.beta.)- Verrucarin A, 7'-deoxo-9,10-epoxy-9,10-dihydro-7'-(1-hydroxyethyl)-, (9R,10S)-