5-hydroxy-5-(4-methoxyphenyl)-3,4-dimethyl-1-(pyridin-2-yl)-1H-pyrrol-2(5H)-one
5-(3,5-bis(trifluoromethyl)phenyl)-5-hydroxy-3,4-dimethyl-1-(pyridin-2-yl)-1H-pyrrol-2(5H)-one
5-hydroxy-3,4-dimethyl-5-phenyl-1-(pyridin-2-yl)-1H-pyrrol-2(5H)-one
2,3-Dimethylmaleic anhydride