for the following products
3-(2-Chloorethyl)-2-methyl-4H-pyrido[1,2-a]pyrimidine-4-on | 3-(2-Chloroethyl)-2-methyl-(4H)-pyrido[1.2-a]pyrimidin-4-one | 3-(2-Chloroethyl)-2-methyl-4H-pyrido-[1,2-a]pyrimidin-4-one and 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyridin[1,2-a]pyrimidine-4-one
