Citrazinic acidCitrazinic acid2,6-Dihydroxyisonicotinic acid2,6-Dihydroxypyridine-4-carboxylic acid2,6-二羟基异烟酸Citrazinic acid2,6-二羟基吡啶-4-羧酸柠嗪酸2,6-Dihydroxyisonicotinic acid2,6-Dihydroxy-isonicotinic acid2,6-Dihydroxypyridine-4-carboxylic acid柠嗪酸2,6-二羟基吡啶-4-羧酸