2-(2 | 3-dichloro-4-(2-(hydroxymethyl)butanoyl)phenoxy)acetic acid (CAS 95772-54-6) | sinônimo 2-Desmethylene-2-hydroxymethyl ethacrynic acid | é uma impureza processual com grupo diclorofenoxi e função ácido acético que pode originar-se por transesterificação incompleta | oxidação parcial ou reações secundárias durante a etapa de acilação. Caracteriza-se por polaridade moderada e detectabilidade por HPLC-UV e LC-MS com fragmentação diagnosticável | além de sinais específicos em RMN para metilenos hidroxilados. Sua presença afeta pureza | estabilidade e segurança do material ativo | exigindo limites de especificação e estratégias de controle como cromatografia preparativa e monitorização em processo.
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