Heterocyclic compounds having antibacterial activity: process for their preparation and pharmaceutical compositions containing them

The present invention relates to novel oxazolidinone compounds of the general formula (I) where R1, R2, R3, Y1, Y2, Y3, and Z are as defined in the description; their derivatives, their analogs, their tautomeric forms, their stereoisomers, their polymorphs, their pharmaceutical acceptable salts, their pharmaceutically acceptable solvates and pharmaceutical compositions containing them.