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Ono EI-601 is the main metabolite of the human neutrophil elastase inhibitor ONO-5046. In plasma and urine by direct injection column-switching HPLC proved to be useful for pharmacokinetic, toxicological and clinical studies.

ONO-EI-601 is the major metabolite of human neutrophil elastase inhibitor ONO-5046. ONO-5046 has the potential for the study of acute lung injury/acute respiratory distress syndrome or disseminated intravascular coagulation in COVID-19[1].

[1] Shintani T, et al. Simultaneous determination of human neutrophil elastase inhibitor (ONO-5046) and its metabolite in plasma and urine by direct injection column-switching HPLC. J Pharm Biomed Anal. 1994 Mar;12(3):397-405. DOI:10.1016/0731-7085(94)90017-5