QNZ is a NR2C/NR2D-selective NMDA receptor non-competitive antagonist (IC50 values are 3, 6, 229, and >300, >300 μM for NR2D, NR2C, NR2A, NR2B, and GluR1, respectively).

Quarfloxin (CX-3543) is a fluoroquinolone derivative with antineoplastic activity.

Questiomycin A is a phenoxazine and a chromophore that has been found in Streptomyces and has antibacterial and anticancer activities.

Quinupristin/dalfopristin, or quinupristin-dalfopristin is a combination of two antibiotics used to treat infections by staphylococci and by vancomycin-resistant Enterococcus faecium.

Q-VD-Oph is a potent pan-caspase inhibitor with IC50 ranged from 25 to 400 nM for caspases 1,3,8, and 9.

QX77 is a chaperone-mediated autophagy (CMA) activator.

R1487 is a p38 MAP kinase inhibitor with an IC50 of 10nM. It may have potential as a treatment for inflammatory diseases such as rheumatoid arthritis.

R1487 is a p38 MAP kinase inhibitor with an IC50 of 10nM. It may have potential as a treatment for inflammatory diseases such as rheumatoid arthritis.

R-7050 is a tumor necrosis factor receptor (TNFR) antagonist with greater selectivity toward TNFα.

RAD140 is a potent, orally bioavailable, nonsteroidal selective androgen receptor modulator (SARM).

Radiprodil is an orally active and selective NMDA NR2B antagonist; a potential therapeutic agent in treatment of neuropathic pain and possibly other chronic pain conditions.

Ramosetron Hydrochloride(YM060 Hydrochloride) is a serotonin 5-HT3 receptor antagonist for the treatment of nausea and vomiting.

Ranolazine(RS-43285) is an antianginal agent with antiarrhythmic properties that achieves its effects via a novel mechanism of action (inhibition of the late phase of the inward sodium current), without affecting heart rate or blood pressure (BP).

Rapastinel(GLYX-13) is a NMDA receptor partial agonist that acts at the glycine site.

Refametinib (RDEA119, Bay 86-9766) is a potent, ATP non-competitive and highly selective inhibitor of MEK1 and MEK2 with IC50 of 19 nM and 47 nM, respectively.

Relugolix is a novel, non-peptide, orally active gonadotropin-releasing hormone (GnRH) antagonist with IC50 of 0.33 nM in the presence of 40% fetal bovine serum, TAK-385 possesses higher affinity and potent antagonistic activity compared with TAK-013.

Reparixin(DF 1681Y) is an inhibitor of CXCL8 receptor, also inhibit CXCR1 and CXCR2 activation, which has been shown to attenuate inflammatory responses in various injury models.

Retigabine 2Hcl (Ezogabine; D23129) is a Kv7.2-7.5 (KCNQ2-5) neuronal potassium channel opener witrh anticonvulsant activity.

RG-13022 is an inhibitor of epidermal growth factor (EGF) receptor kinase with an IC50 value of 1 µM in HT-22 cells.

RG2833 is a brain-penetrant inhibitor of HDAC with IC50 values of 60 nM and 50 nM for HDAC1 and HDAC3, respectively.

RG7112 (RO5045337) is an orally bioavailable and selective p53-MDM2 inhibitor.

RG7388 is an oral, selective, small molecule MDM2 antagonist that inhibits binding of MDM2 to p53.

RI-1 is a RAD51 inhibitor with IC50 ranging from 5 to 30 μM.

F13714 fumarate, a selective 5-HT1A receptor biased agonist, shows antidepressant-like properties after a single administration in the mouse model of chronic mild stress.

RITA (NSC 652287) is a DNA damaging agent with IC50 of 2 nM and 20 nM in A498 and TK-10 cells.

RK-24466 (KIN 001-51) is a potent and selective Lck inhibitor; inhibits Lck (64-509) and LckCD isoforms with IC50s of less than 1 and 2 nM, respectively.

RK-287107 (RK287107) is a novel potent, tankyrase-specific inhibitor with IC50 of 14.3 and 10.6 nM for tankyrase-1 and tankyrase-2, respectively, shows no activity against PARP-1.

RMC-4550 (RMC4550) is a potent, selective, allosteric inhibitor of SHP2 with IC50 of 0.58 nM (full-length SHP2 enzyme), suppresses pERK signaling in Calu-1 cells with IC50 of 7 nM.

RN-18 is a selective inhibitor of virion infectivity factor (Vif) APOBEC interactions and HIV-1 replication.

Ro 41-1049 hydrochloride is a selective, reversible inhibitor of MAO-A.