1-methylpyridin-1-ium-4-carboxylic acid

trimethyl-[4-methyl-2,6-bis(trimethylsilyloxy)pyrimidin-5-yl]oxysilane

5-羟基-4-甲基嘧啶

1-benzyl-6-methylpyrimidine-2,4-dione

5-氯-6-甲基尿嘧啶