28282-65-7 6'beta-Hydroxy-2',2',4',6'-tetramethylspiro(cyclopropane-1,5'-(5H)indene)-3',7'(2'H,6'H)-dione Dehydroilludin M Spiro(cyclopropane-1,5'-(5H)indene)-3',7'(2'H,6'H)-dione, 6'beta-hydroxy-2',2',4',6'-tetramethyl-