El p-toluenosulfonato de éster bencílico de L-alanina, CAS 42854-62-6, es la sal tosilato de un éster de aminoácido protegido y, por tanto, una impureza orgánica relacionada con el proceso, no una estructura clásica de alerta genotóxica. Con fórmula molecular C17H21NO5S y peso molecular de 351,42 g/mol, puede originarse por esterificación incompleta, formación de sal o arrastre de intermedios bencílicos en síntesis de aminoácidos o péptidos. Su carácter iónico y el grupo sulfonato aromático suelen requerir LC-MS/MS para la cuantificación de trazas, mientras que LC-UV o HILIC pueden apoyar la separación de especies polares afines. La estabilidad depende de la hidrólisis y del comportamiento iónico.
Referencias
Abou Fayad, Antoine, et al. “A One-Pot Synthesis of Symmetrical and Unsymmetrical Dipeptide Ureas.â€Â St-Andrews.ac.uk, July 2016,  https://doi.org/1434-193X.
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