PC786 (PC-786) is a potent non-nucleoside RSV L-protein polymerase inhibitor with IC50 of 2.1 nM and 0.5 nM in cell-free enzyme assay and mini-genome assay in HEp-2 cells, respectively.

JNJ 2408068 is a potent RSV (respiratory syncytial virus) inhibitor. JNJ2408068 significantly inhibits replication of RSV A and B subtypes in the lungs of cotton rats without any evidence of toxicity. The minimum protective dose of JNJ 2408068 appears to be approximately 0.39 mg/kg[1].

RSV604 is a novel inhibitor of respiratory syncytial virus replication(EC50=0.86 uM); a putative RSV nucleoprotein(N) inhibitor in phase 2 clinical trials.

Sisunatovir, also known as RV521, is a highly potent fusion inhibitor with efficacy against a panel of clinical isolates of RSV-A and RSV-B viruses. RV521 exhibited a mean IC50 of 1.2 nM against a panel of RSV A and B laboratory strains and clinical isolates with antiviral efficacy in the Balb/C mouse model of RSV infection. Oral bioavailability in preclinical species ranged from 42 to >100% with evidence of highly efficient penetration into lung tissue. In healthy adult human volunteers experimentally infected with RSV, a potent antiviral effect was observed with a significant reduction in viral load and symptoms compared to placebo.

Sisunatovir (RV521), an orally available inhibitor of the RSV fusion (RSV-F) protein, exhibits potent efficacy against a panel of clinical isolates of RSV-A and RSV-B viruses, with IC50s of 1.4 nM and 1.0 nM, respectively.

A potent respiratory syncytial virus (RSV) fusion inhibitor..