77620-58-7 NSC325629 Spiro(2,5-methano-1-benzoxepin-10,2'-oxirane), trichothec-9-ene-3,8-dione deriv. Trichothec-9-ene-3,8-dione, 15-(acetyloxy)-12,13-epoxy-4-[(2-methyl-1-oxo-2-propenyl)oxy]-, (4.beta.)-