2H-cyclohepta[b]furan-2-one, 3-chloro-8,8a-dihydro- 7-methyl-1,4-dioxaspiro[2.4]heptan-5-one (non-preferred name) InChI=1/C6H8O3/c1-4-2-5(7)9-6(4)3-8-6/h4H,2-3H2,1H