Formation of 3a′,8′-dimethyl-3a′,5′-dihydro-1′H,3′H-dispiro-[cyclohexane-1,3′-furo[3,4-f][2]benzofuran-5′,1″-cyclohexane]-1′,7′(4′H)-dione in the reaction of 3-acetyl-4-methyl-1-oxaspiro[4.5]dec-3-en-2-one with potassium hydroxide

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