El N,N’-diacetil-L-cistina dimetil éster, CAS 32381-28-5, es un derivado dimérico de cistina que contiene azufre, con fórmula molecular C12H20N2O6S2 y peso molecular de 352,43 g/mol. Estructuralmente corresponde al diéster O-metilado de la N,N’-diacetilcistina-L, conservando el enlace disulfuro y dos centros estereogénicos acetamidados. Esta especie puede formarse como intermediario de síntesis, subproducto de acoplamiento o producto de dimerización oxidativa en la química de derivados de cisteína. Por su polaridad y funcionalidad disulfuro, su detección y cuantificación suelen requerir LC-MS/MS, espectrometría de masas de alta resolución y, si es necesario, confirmación por RMN, ya que GC-MS por sí sola suele ser insuficiente. No es una nitrosamina, pero sigue siendo relevante en el monitoreo regulatorio de impurezas de proceso.
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