5-Acetyl-1,4-dihydro-2,6-dimethyl-4-phenylnicotinic acid ethyl ester

5-Acetyl-1,4-dihydro-2,6-dimethyl-4-phenyl-3-pyridinecarboxylic acid ethyl ester

2,6-Dimethyl-4-phenyl-5-acetyl-1,4-dihydropyridine-3-carboxylic acid ethyl ester