比卡林

(3R,4S)-3-hydroxy-2,2-dimethyl-4-(2-oxopyridin-1-yl)-3,4-dihydrochromene-6-carbonitrile

trans-3,4-dihydro-3-hydroxy-2,2-dimethyl-4-(3-pyridyloxy)-2H-1-benzopyran-6-carbonitrile

2,2-dimethyl-4-(2-oxopyrrolidin-1-yl)chromene-6-carbonitrile

2,2-dimethyl-4-(2-oxopiperidin-1-yl)chromene-6-carbonitrile