[{"from": "human", "value": "Provide a description of this molecule. [C][C@H1][C][O][C][=C][N][Ring1][=Branch1][C][=C][Branch2][Ring1][O][C][=Branch1][C][=O][C][Ring1][#Branch1][=C][C][=Branch1][#C][=C][Ring1][O][N][C][C][N][Branch1][Branch1][C][C][Ring1][=Branch1][C][F][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a fluoroquinolone antibiotic and the optical S-(-) isomer of racemic [ofloxacin]. It reportedly carries 8 to 128-fold more activity against both gram-negative and gram-positive bacteria compared to R-(+)-ofloxacin and remains stereochemically stable following administration (i.e. it does not invert to the inactive isomer). Levofloxacin, along with other quinolones such as [gatifloxacin] and [moxifloxacin], is a member of the third generation of fluoroquinolones, colloquially referred to as the \"respiratory quinolones\" due to improved activity against gram-positive bacteria commonly implicated in respiratory infections.  Levofloxacin was first approved by the FDA in 1996, and was approved in Canada and several South American countries soon after."}]