(R)-N-((R)-1-Amino-1-oxobutan-2-yl)-3-((((S)-1-amino-1-oxobutan-2-yl)amino)methyl)hexanamide é descrita como uma impureza estereoquímica de interesse analítico | caracterizada por múltiplos centros quirais e por sua semelhança isotópica com o composto alvo | o que complica a identificação por métodos convencionais. Esta impureza tipicamente surge por epimerização durante reações de acoplamento peptídico ou por incompleta proteção/deproteção | exigindo estratégias de controle rigorosas. A detecção robusta requer HPLC quiral acoplado a LC-MS/MS e confirmação por RMN bidimensional e espectrometria de alta resolução. O perfil toxicológico e o impacto na atividade farmacológica demandam especificações e estudos comparativos para atender às diretrizes de controle de impurezas.
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