79320-85-7 NSC320016 Spiro(2,5-methano-1-benzoxepin-10,2'-oxirane), trichothec-9-en-3-one deriv. Trichothec-9-en-3-one, 12,13-epoxy-4,15-bis[(2-methyl-1-oxo-2-propenyl)oxy]-, (4.beta.)-