3-Methyl-4-(4-methyl-benzoyl)-1-oxa-spiro[4.5]dec-3-en-2-one
3-Methyl-4-(2-methyl-benzoyl)-1-oxa-spiro[4.5]dec-3-en-2-one
3-Methyl-2-oxo-1-oxa-spiro[4.5]dec-3-ene-4-carboxylic acid 4-(benzyl-methyl-amino)-but-2-ynyl ester
3-Methyl-2-oxo-1-oxa-spiro[4.5]dec-3-ene-4-carboxylic acid [4-(benzyl-methyl-amino)-but-2-ynyl]-amide
4-[(4-Bromo-phenyl)-hydroxy-methyl]-3-methyl-1-oxa-spiro[4.5]dec-3-en-2-one