Sapropterin Impurity D (CAS 2236-60-4) é uma impureza identificada no perfil de estabilidade e controle de qualidade de lotes de sapropterina. Quimicamente descrita como 2-aminopteridin-4(3H)-ona e também referida como 2-Amino-4-oxopteridina | apresenta caráter polar que influencia retenção em cromatografia reversa. A detecção e quantificação requerem métodos validados por HPLC com detector UV e confirmação por espectrometria de massa e RMN para caracterização estrutural. Sua inclusão em especificações permite estabelecer limites de aceitação | avaliar formação por degradação forçada e aplicar estratégias de controle durante síntese e purificação para reduzir riscos ao perfil de qualidade.
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