diethyl 5-hydroxy-6-methylpyridine-3,4-dicarboxylate

甲基 3-氰基-2-羟基-6-甲基异尼古丁酸酯

5-amino-6-methylpyridine-3,4-dicarboxylic acid

3-cyano-2-hydroxy-6-methyl-5-nitro-isonicotinic acid methyl ester

2-chloro-3-cyano-6-methyl-5-nitro-isonicotinic acid methyl ester