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1-(TERT-BUTYLDIMETHYLSILYLOXY)-1,2,3,3A,5A,6-HEXAHYDROSPIRO[CYCLOPENTA[C]INDENE-4,2'-[1,3]DITHIAN]-7(5H)-ONE 1-(TERT-BUTYLDIMETHYLSILYLOXY)-1,2,3,3A,5A,6-HEXAHYDROSPIRO[CYCLOPENTA[C]INDENE-4,2'-[1,3]DITHIAN]-7(5H)-ONE