THE PRESENT INVENTION IS DIRECTED TO MALATE SALTS OF (3S, 5S)-7-[3-AMINO-5-METHYL-PIPERIDINYL]-1-CYCLOPROPYL-1, 4-DIHYDRO-8-METHOXY-4-OXO-3-QUINOLINECARBOXYLIC ACID, AND ITS POLYMORPHS. THE PRESENT INVENTION IS ALSO DIRECTED TO PHARMACEUTICAL COMPOSITIONS COMPRISING THE DESCRIBED SALTS AND POLYMORPHS.