Etoricoxib D4 (MK-0663 D4) is a deuterium labeled Etoricoxib. Etoricoxib is a non steroidal anti-inflammatory agent, acting as a selective and orally active COX-2 inhibitor, with IC50s of 1.1 μM and 116 μM for COX-2 and COX-1 in human whole blood.
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