155866-40-3 Cladospirone bisepoxide Spiro(2a,6a-epoxynaphth(2,3-b)oxirene-2(1aH),2'-naphtho(1,8-de)(1,3)dioxin)-3(6H)-one, 7,7a-dihydro-6,7-dihydroxy-, (1aR-(1aalpha,2abeta,6alpha,6abeta,7beta,7aalpha))-