56326-23-9 BRN 1263891 Spiro(naphth(1,2-b)oxirene-5(1a-H),2'-oxirane)-2,6-diol, 2,3,3a,4,6,7b-hexahydro-3'-(hydroxymethyl)-3,3',3a-trimethyl-, 2-acetate Tetrahydro pr toxin