2-Butyl-4-chloro-5-formylimidazole

2-Butyl-4-chloro-5-formylimidazole (CAS 83857-96-9), also referenced as Losartan Related Compound A / Impurity D, is supplied by Hunan HuaTeng Pharmaceutical Co., Ltd. at pharmaceutical grade for R&D, pilot, and commercial-scale use in preparing N-(biphenylylmethyl)imidazole angiotensin II antagonists. The supplier trades rather than manufactures the compound and distributes it across North America, Western and Eastern Europe, and Asia.