1-methyl-4-(p-tolylamino)-5,6-dihydropyridin-2(1H)-one

ethyl 5-[methyl(tert-butoxycarbonyl)amino]-3-oxopentanoate

对甲苯胺

ethyl 5-[(tert-butoxycarbonyl)(methyl)amino]-3-(p-tolylamino)pent-2-enoate