1,2-dihydro-5-methyl-2-oxo-1,6-naphthyridine-3-carboxylic acid hydrazide

3-amino-5-methyl-1H-1,6-naphthyridin-2-one

5-乙酰基-6-甲基-2-氧代-1,2-二羟基吡啶-3-甲腈

5-methyl-2-oxo-1H-1,6-naphthyridine-3-carbonitrile

5-methyl-2-oxo-1H-1,6-naphthyridine-3-carboxamide