Este estándar de impureza corresponde a una especie dimérica, unida por enlaces poliamida y carente de piroglutamato, relacionada con un intermedio sintético de tipo peptidomimético o con un subproducto de proceso más que con un degradante simple. La estructura, C26H40N6O11, masa molecular 612,63 g/mol, contiene varios enlaces amida, dos motivos de 2-metilpirrolidina-2-carboxamida y funciones terminales aminoacetilo y ácido pentanedioico, lo que confiere elevada polaridad y gran capacidad de enlace de hidrógeno. Su detección y cuantificación suelen requerir LC en fase reversa acoplada a MS de alta resolución o LC-MS/MS, con apoyo de RMN para la asignación estructural. Su presencia se interpreta en el contexto del perfil de impurezas y de la química de proceso.
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