La sal disódica de (S)-ftaloilalanina es una impureza iónica derivada de ftalimida, asociada a la química de protección y desprotección en la síntesis de péptidos o aminoácidos, cuando una hidrólisis incompleta o una reorganización deja un residuo aniónico persistente. Su fórmula molecular, C11H9NO5.2Na, corresponde a un peso molecular de 235.20 más 2 x 22.99 g/mol, reflejando la forma de sal disódica. La identificación y cuantificación traza se realizan habitualmente por LC-MS/MS, mientras que la cromatografía iónica o los métodos HILIC ayudan a separar impurezas aromáticas relacionadas. Como especie polar no volátil, no es adecuada para GC-MS sin derivatización.
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