74560-38-6 NSC283445 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, 9,10-EPOXIDE Verrucarin A 9,10-epoxide Verrucarin A, 9,10-epoxy-9,10-dihydro-, (9R,10S)-