A-689 (AZD-7295) was the lead compound from Arrow Therapeutics' second series of hepatitis C virus (HCV) NS5a inhibitors. AZD-7295 is a selective inhibitor of HCV NS5A within vitroantiviral activity of 7nM and 1.24mM against HCV genotype1b and 1a replicons respectively, with significant liver concentrationin preclinical studies. AZD-7295 was well tolerated at repeated doses ofup to 700 mg daily. AZD-7295 shows potent antiviral activity ingenotype 1b patients. Genotype 1a and genotype 3 patients showedno antiviral effects.

GS-9820 (formerly CAL-120) is an oral, small molecule delta selective Phosphatidylinositol 3-kinases (PI3 kinase) inhibitor, a first in class compound, with greater than 200-fold selectivity in cell-based assays for the delta isoform as compared to other class isoforms. GS-9820 is designed to induce cancer cell death and inhibit signaling pathways associated with cancer cell dependence on the tumor microenvironment. GS-9820 is on the phase I of clinical trial, where has to be determined the appropriate dosing regimen of drug in subjects with lymphoid malignancies.

PF-00446687 is the highly selective, brain-penetrant, melanocortin 4 receptor (MC4R) agonist. PF-00446687 induced partner preferences formation in females prairie voles after a 6-h cohabitation without mating. PF-00446687 had been in phase I clinical trial for the treatment of sexual function disorders.

ACT-281959 (molecular weight 850.9 g/mol), the di-ester prodrug of ACT-246475 (molecular weight 618.6 g/mol), was developed to improve absorption after oral dosing and is rapidly converted by esterases in vivo to ACT-246475 in two-steps via the formation of ACT-409100 (molecular weight 734.7 g/mol), the mono-ester prodrug. ACT-281959 is a novel potent and selective P2Y12 receptor antagonist with a wider therapeutic window. ACT-281959 showed antithrombotic efficacy after oral administration in the rat ferric chloride model. ACT-281959 entered clinical studies in healthy volunteers. ACT-281959 had been in phase I clinical trials by Actelion for the treatment of thrombosis. But there is no development reported for this study recently.