This invention provides {HEAD ~ novel pyridonecarboxylic acid derivatives} having {TAIL ~ a quite high antimicrobial activity} 
This invention provides { HEAD ~ novel pyridonecarboxylic acid derivatives } having { TAIL ~ a quite high antimicrobial activity }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL