7-hydroxynalidixic acid

7-Hydroxymethylnalidixic acid

1-Ethyl-4-oxo-7-(hydroxymethyl)-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid

1-Ethyl-1,4-dihydro-7-(hydroxymethyl)-4-oxo-1,8-naphthyridine-3-carboxylic acid

1,4-Dihydro-1-ethyl-4-oxo-7-(hydroxymethyl)-1,8-naphthyridine-3-carboxylic acid