Roflumilast (Daxas) is a selective inhibitor of PDE4 with IC50 of 0.2-4.3 nM.

Roflumilast N-oxide is a phosphodiesterase 4 inhibitor. Roflumilast N-oxide is the active metabolite of roflumilast.

Rogaratinib (BAY 1163877) is a potent, selective, orally available pan-FGFR with IC50 of 15, <1, 19 and 33 nM for FGFR1, 2, 3 and 4, respectively.

Romidepsin strongly inhibits HDAC1 and HDAC2 with IC50 of 1.6 nM and 3.9 nM, respectively, but is relatively weak in inhibiting HDAC4 and HDAC6 with IC50 25 nM and 790 nM, respectively.

Ropivacaine Hydrochloride Monohydrate is used as a local anesthetic.

Roscovitine (Seliciclib, CYC202, R-roscovitine) is a potent and selective CDK inhibitor for Cdc2/cyclin B, CDK2/cyclin A, CDK2/cyclin E and CDK5/p53 with IC50 of 0.65 μM, 0.7 μM, 0.7 μM and 0.16 μM, respectively.

Roseoflavin is a chemical analog of FMN and riboflavin that has antimicrobial activity.

Rosiglitazone maleate is a potent and selective activator of PPARγ, with EC50s of 30 nM, 100 nM and 60 nM for PPARγ1, PPARγ2, and PPARγ, respectively, and a Kd of appr 40 nM for PPARγ; Rosiglitazone maleate is also an modulator of TRP channels, inhibits T

Rostafuroxin: an ouabain-inhibitor counteracting specific forms of hypertension.

Rottlerin (Mallotoxin.

RP-5063 (Brilaroxazine) is a multimodal dopamine and serotonin modulator with partial agonist activity at DA D2, D3, D4, 5-HT1A, and 5-HT2ARs, and antagonist activity at 5-HT2B, 5-HT6 and 5-HT7Rs.

Rp-8-bromo-Cyclic AMPS (Rp-8-bromo-cAMPS) is a cell-permeable cAMP analog that combines an exocyclic sulfur substitution in the equatorial position of the cyclophosphate ring with a bromine substitution in the adenine base of cAMP.

RPI-1 is a cell-permeable ATP-competitive tyrosine kinase inhibitor

RQ-00203078 is a potent TRPM8 antagonist (IC50 values are 5.3 and 8.3 nM for rat and human channels respectively).

RR6 is a selective, reversible, and competitive vanin inhibitor.

RRx-001 is a novel epigenetic modulator with potential radiosensitizing activity. It inhibits glucose 6-phosphate dehydrogenase(G6PD) in human tumor cells, binds hemoglobin and drives RBC-mediated redox reactions under hypoxia.

RS 102895 hydrochloride is a chemokine receptor CCR2 antagonist.

RS 504393 is a selective CCR2 chemokine receptor antagonist (IC50 values are 98 nM and > 100 μM for inhibition of human recombinant CCR2b and CCR1 receptors respectively).

RS-1 is a stimulator of the human homologous recombination protein RAD51,enhances homology-directed repair ~2 to 5-fold and increases CRISPR-mediated knock-in efficiencies in vitro and in vivo.

RS-127445 is a potent and selective antagonist at the serotonin 5-HT2B receptor, with around 1000x selectivity over the closely related 5-HT2A and 5-HT2C receptors.

RSL3 is a ferroptosis activator in a VDAC-independent manner,exhibiting selectivity for tumor cells bearing oncogenic RAS.

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.