O sal p-toluenossulfonato do éster benzílico de L-alanina, CAS 42854-62-6, é o sal tosilato de um éster de aminoácido protegido e, portanto, uma impureza orgânica de origem processual, não uma estrutura clássica de alerta genotóxico. Com fórmula molecular C17H21NO5S e massa molecular de 351,42 g/mol, pode resultar de esterificação incompleta, formação de sal ou arraste de intermediários benzilados na síntese de aminoácidos ou peptídeos. Seu caráter iônico e o grupo sulfonato aromático normalmente exigem LC-MS/MS para quantificação em traços, enquanto LC-UV ou HILIC podem auxiliar na separação de espécies polares relacionadas. A estabilidade é governada por hidrólise e interação com o contraíon.
Referências
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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