Ro 64-6198 is a nonpeptidic, selective, brain-penetrant agonist of nociceptin/orphanin FQ receptor (NOP receptor/ORL1) with pKi of 9.41.

Ro 60-0175 is a potent, selective 5-HT2C receptor agonist with pKi of 9, 7.5, 5.4, 5.2 and 5.6 for human 5-HT2C, 2A, 1A, 6 and 7 receptors respectively.

RO 28-2653 is a potent, selective and orally active matrix-metalloproteinases (MMPs) MMP2, MMP9 and MMP14 inhibitor with IC50 of 10, 12 and 10 nM, shows no activity against MMP3 and MMP1 (IC50>1 uM).

RO 2443 is a potent, dual MDM2/MDMX antagonist that inhibits both MDM2 (IC50=33 nM) and MDMX (IC50=41 nM) binding to p53, but poor water solubility does not allow for a meaningful assessment of its cellular activity..

Ro 08-2750 (Ro 082750) is a potent, selective, non-peptide nerve growth factor (NGF) inhibitor that binds to NGF dimer with Kd of 1 uM.

RNPA2000 is a small-molecule inhibitor of Staphylococcus aureus RnpA-mediated RNA turnover and tRNA processing (IC50=130 uM).

RNPA1000 is a potent, specific small molecule inhibitor of S. aureus RnpA RNA degradation activity (IC50=100-125 uM), limits S. aureus mRNA turnover and growth.

RNase L-IN-2 is a small-molecule activator of RNase L with EC50 of 22 uM.

RK-20449 (RK20449) is a potent, small molecule inhibitor of hematopoietic cell kinase (HCK) with IC50 of 0.43 nM.

RJR-2403 (Rivanicline, Metanicotine) is a potent, selective neuronal nicotinic ACh (nAChR) agonist with high affinity to rat brain cortex (Ki=26 nM), does not significantly activate muscle type nAChRs or muscarinic receptors.

RJR-2403 (Rivanicline, Metanicotine) is a potent, selective neuronal nicotinic ACh (nAChR) agonist with high affinity to rat brain cortex (Ki=26 nM), does not significantly activate muscle type nAChRs or muscarinic receptors.

Rivipansel sodium (GMI-1070, PF-06460031) is a novel small molecule glycomimetic pan-Selectin antagonist with IC50 of 4.3 uM, 423 uM and 337 uM for E-selectin, P-selectin and L-selectin, respectively.

Rislenemdaz (MK 0657.

Rislenemdaz (MK 0657.

Risedronic acid (Actonel)

Risedronate sodium is a pyridinyl biphosphonate which inhibits osteoclast-mediated bone resorption.

RIPK2 inhibitor OD36 is a potent, specific, ATP-competitive inhibitor of RIPK2 with IC50 of 5.3 nM, inhibits Tyr and Ser/Thr-directed activities of RIPK2.

RIPK2 inhibitor 1 is a novel potent, selective RIPK2 inhibitor with IC50 of 5-10 nM.

RIPGBM is a cell type-selective, small molecule inducer of apoptosis in GBM cancer stem cells (CSCs) with EC50 of 220 nM (GBM 1 cells).

RIP1-IN-22 is a highly potent, orally available, and brain-penetrating RIP1 kinase inhibitor with pKi of 9.04.

Rimantadine (Flumadine)

rifomycins

Rifaximin is an oral, semi-synthetic antibiotic derived from Rifamycin SV with antibacterial activity, interferes with transcription by binding to the β-subunit of bacterial RNA polymerase.

Rifapentine (Priftin)

Riboflavine phosphate is a very effective NAD+-recycling agent.

Rhosin (G04) is a potent, specific RhoA subfamily Rho GTPases inhibitor that specifically binds to RhoA to inhibit GEF reaction of RhoA with Kd of 0.4 uM, does not interact with Cdc42 or Rac1, nor the LARG.

Rheochrysidin (Physcione)

Rhein(Monorhein)

RH01386 is a small molecule that protect pancreatic β cells against endoplasmic reticulum stress-induced cell death.

Revexepride (SSP 002358.