4-(2-aminochloranuidylethyl)-4-ethynyl-2-methylcyclohexa-2,5-dien-1-one;4-(3-aminochloranuidylpropyl)-4-ethynyl-2-methylcyclohexa-2,5-dien-1-one;4-benzyl-4-ethynyl-2-methylcyclohexa-2,5-dien-1-one;carbon dioxide;4-(3,3-dimethylbutyl)-4-ethynyl-2-methylcyclohexa-2,5-dien-1-one;4-(2,2-diphenylethyl)-4-ethynyl-2-methylcyclohexa-2,5-dien-1-one;3-ethenyl-3-methyl-6-oxocyclohexa-1,4-diene-1-carbonitrile;4-ethyl-4-ethynyl-2-methylcyclohexa-2,5-dien-1-one;4-ethynyl-2,4-dimethylcyclohexa-2,5-dien-1-one;4-ethynyl-2,4-dimethylcyclohex-2-en-1-one;4-ethynyl-4,6-dimethylcyclohex-2-en-1-one;4-ethynyl-4-(3-hydroxypropyl)-2-methylcyclohexa-2,5-dien-1-one;4-ethynyl-4-[4-(1H-imidazol-2-yl)but-3-ynyl]-2-methylcyclohexa-2,5-dien-1-one;4-ethynyl-2-methyl-4-(2-phenylethyl)cyclohexa-2,5-dien-1-one;6-isocyano-2,2,4,4-tetramethylcyclohexan-1-one;2-isocyano-4,4,6,6-tetramethylcyclohex-2-en-1-one