Rivaroxaban Impurity 142, CAS 59337-89-2, es una impureza organosulfurada clorada de bajo peso molecular, con fórmula C5H3ClO2S y peso molecular de 162,59 g/mol. Desde el punto de vista estructural, es coherente con un intermedio o degradante de tipo clorotiofeno carboxilato, derivado de la formación incompleta del enlace sulfonamida, del intercambio de halógenos o de la escisión hidrolítica durante etapas de síntesis relacionadas con rivaroxabán. Su centro de cloro electrofílico y el azufre heteroaromático justifican un control estricto en los perfiles de impurezas. La determinación a nivel traza suele requerir LC-MS/MS con confirmación por MS de alta resolución y, cuando la volatilidad o la derivatización lo permiten, GC-MS para la asignación estructural. Su significación toxicológica debe evaluarse en marcos de cualificación de impurezas.
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