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4-ethyl-10-hydroxyspiro[6,7-dihydropyrano[5,6-g]chromene-8,1'-cyclohexane]-2-one 6-ethyl-10-hydroxy-spiro[3,4-dihydropyrano[3,2-g]chromene-2,1-cyclohexane]-8-one 4-ethyl-10-hydroxy-2-spiro[6,7-dihydropyrano[5,6-g]chromene-8,1'-cyclohexane]one 4-ethyl-10-hydroxy-spiro[6,7-dihydropyrano[5,6-g]chromene-8,1'-cyclohexane]-2-one 6'-Ethyl-10'-hydroxy-3',4'-dihydro-8'H-spiro[cyclo hexane-1,2'-pyrano[3,2-g]chromen]-8'-one 6'-ethyl-10'-hydroxy-4',8'-dihydro-3'H-spiro[cyclohexane-1,2'-pyrano[3,2-g]chromene]-8'-one Spiro[2H,8H-benzo[1,2-b:5,4-b']dipyran-2,1'-cyclohexane]-8-one, 6-ethyl-3,4-dihydro-10-hydroxy-