6-ethyl-2-methyl-1-oxido-4-phenylpyrimidin-1-ium

6-ethyl-4-methoxy-2-methyl-1-oxidopyrimidin-1-ium

2-(chloromethyl)-4-ethyl-6-methoxypyrimidine

2-methyl-6-(1-nitrosoethylidene)-1H-pyrimidine