1-(2-metoxifenoxi)-3-(2-metoxifenilamino)propan-2-ol, C17H21NO4, con peso molecular de 303,35 g/mol, es un aminoalcohol secundario con dos motivos éter anisílico y un esqueleto hidroxipropílico quiral. La estructura es compatible con una impureza relacionada con el proceso o con un intermedio sintético derivado de una O-arilación o N-alquilación incompleta, o de reordenamientos durante la fabricación multietapa de ariloxipropanolaminas afines. Su perfil polar e ionizable suele requerir LC-MS/MS para la caracterización a nivel traza, con confirmación por LC-HRMS y técnicas ortogonales como HPLC-UV o GC-MS tras derivatización cuando se precisa volatilidad. La evaluación regulatoria debe considerar el origen, el factor de respuesta relativo y la posible transferencia al principio activo final.
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