Levofloxacin EP Impurity A, também designada (R)-(+)-ofloxacino, D-ofloxacino ou isômero R do ofloxacino, é uma impureza enantiomérica associada ao esqueleto fluoroquinolônico. Apresenta fórmula molecular C18H20FN3O4 e massa molecular de 361.37 g/mol, CAS 100986-86-5. Essa espécie estereoquímica geralmente decorre de controle assimétrico incompleto, racemização durante a síntese ou arraste epimérico na produção de ofloxacino. Sua presença é avaliada em especificações farmacopéicas de impurezas, pois a configuração pode alterar o perfil antimicrobiano e a pureza quiral. A quantificação costuma exigir HPLC quiral com detecção por UV, complementada por LC-MS/MS para confirmação.
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