Telmisartan EP Impurity H, 즉 Telmisartan Bromo t-Butyl Ester, CAS 114772-40-6는 텔미사르탄 공정 화학에서 유래하는 브로민화 에스터 중간체로서, 전형적인 분해산물이 아니다. 분자식 C18H19BrO2, 분자량 347.25는 지용성 아릴 브로마이드 골격을 나타내며, 비페닐 테트라졸계 항고혈압제 합성 중 불완전한 전환 또는 부반응에 의해 생성될 수 있다. 브로민화 불순물은 미량으로 잔존하면서 불순물 프로파일에 영향을 주므로, 동정 및 정량에는 LC-MS/MS, 고분해능 LC-MS, 보조적 HPLC-UV가 통상 사용된다. 휘발성 불순물 평가는 GC-MS로 지원될 수 있다. 이는 니트로사민은 아니지만 규제적 불순물 관리 범주에 속한다.
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