Percobaan Sintesis Senyawa 2,6-dimetil-4-[4-(trifluorometil)fenil]-1,4-dihidropiridin-3,5-dikarbaldehida dan 2,6-dimetil-4-[2-etenilfenil]-1,4-dihidropiridin-3,5-dikarbaldehida = Experimental Synthesis of 2,6-dimethyl-4-[4-(trifluoromethyl)phenyl]-1,4-dihydropyridine-3,5-dicarbaldehyde and 2,6-dimethyl-4-[2-phenylethenyl]-1,4-dihydropyridine-3,5-dicarbaldehyde