Aprocitentan D4 (ACT-132577 D4) is a deuterium-labeled Aprocitentan. Aprocitentan is a major and pharmacologically active metabolite of Macitentan. Aprocitentan is a dual ETA ETB antagonist (IC50s: 3.4 nM and 987 nM; pA2s: 6.7 and 5.5).
GP531 is a second-generation adenosine regulating agent. It is pharmacologically silent under basal conditions but increases localized endogenous adenosine during ischemia.
Naproxen is a COX-1 and COX-2 inhibitor (IC50s: 8.72 and 5.15 μM, respectively in cell assay). Naproxen etemesil is a lipophilic and non-acidic prodrug of naproxen. It is hydrolyzed to pharmacologically active Naproxen once absorbed.
Hydroxy bosentan (Ro 48-5033) is a primary metabolite of Bosentan (BOS) metabolized by the cytochrome P450 system in the liver, assisting BOS pharmacologically with 10%-20% activity retention.