para-thiocresol
ethyl 3-(ethylamino)propanoate
1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(p-tolylthio)-1,8-naphthyridine-3-carboxylic acid
ethyl 2-
ethyl 4-amino-1-ethyl-6-fluoro-1,2-dihydro-7-(p-tolylthio)-1,8-naphthyridine-3-carboxylate