(1aS,2R,7aS)-2-Hydroxy-4-methyl-1a,2,4,7a-tetrahydro-1,5-dioxa-cyclopropa[b]naphthalen-7-one

(1S,6R)-3-(((tert-butyldiphenylsilyl)oxy)methyl)-5',5'-diethyl-4-((E)-prop-1-en-1-yl)-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-5-one