SNS-032(BMS-387032) is a potent inhibitor of cyclin-dependent kinases (cdks) 9, 2 and 7 (IC50 values are 4, 38 and 62 nM respectively).

Smoothened Agonist (SAG) HCl is a cell-permeable Smoothened (Smo) agonist with EC50 of 3 nM in Shh-LIGHT2 cells.

SMI-4a is a potent inhibitor of Pim1 with IC50 of 17 nM, modest potent to Pim-2, does not significantly inhibit other serine/threonine- or tyrosine-kinases.

SLx-2119(KD-025) is a small molecule and selective inhibitor of ROCK2 with IC50 of 105 nM; > 200 fold selecivity over ROCK1(IC50 =24 uM)

Skp2 Inhibitor C1(SKPin C1) is a specific small molecule inhibitor of Skp2-mediated p27 degradation, selectively inhibited Skp2-mediated p27 degradation by reducing p27 binding through key compound-receptor contacts.

SKLB610, a novel multi-targeted inhibitor, inhibits angiogenesis-related tyrosine kinase VEGFR2, FGFR2 and PDGFR at rate of 97%, 65% and 55%, respectively, at concentration of 10 μM in biochemical kinase assays.

SKLB1002 is a novel and potent VEGFR-2 inhibitor with an IC50 value of 32 nM.

SKF-86002 is a potent inhibitor of p38 MAP kinase wit IC50 of 0.5-1 uM; inhibits LPS-induced IL-1 and TNF-α production in human monocytes (IC50 = 1 μM).

Skepinone-L is a selective p38α-MAPK inhibitor with IC50 of 5 nM.

Sivelestat(ONO5046; LY544349; EI546) is a competitive inhibitor of human neutrophil elastase(IC50 = 44 nM; Ki=200 nM); also inhibited leukocyte elastase obtained from rabbit, rat, hamster and mouse.

Sitravatinib (MGCD516) is a novel small molecule inhibitor targeting multiple RTKs involved in driving sarcoma cell growth, including c-Kit, PDGFRβ, PDGFRα, c-Met, and Axl.

Sitaxentan sodium (TBC-11251) is a selective endothelin receptor-A antagonist with IC50 and Ki of 1.4 nM and 0.43 nM, respectively.

Sirtinol is a cell-permeable, specific inhibitor of sirtuin NAD-dependant histone deacetylases.

SIRT2 Inhibitor II, AK-1 inhibits SIRT2 selectively over SIRT1 and SIRT3.

Siramesine(Lu 28-179) is a selective sigma-2 receptor agonist, which has been shown to trigger cell death of cancer cells and to exhibit a potent anticancer activity in vivo.

Siramesine(Lu 28-179) Hcl is a selective sigma-2 receptor agonist, which has been shown to trigger cell death of cancer cells and to exhibit a potent anticancer activity in vivo.

Sildenafil is a Phosphodiesterase 5 Inhibitor with IC50 of 5.22 nM.

SHP099 is a selective, orally bioavailable, and efficacious SHP2 inhibitor with IC50 =0.07 μM and p-ERK modulation in cells IC50 = 0.250 μM.

SGX-523 is a selective Met inhibitor with IC50 of 4 nM, no activity to BRAFV599E, c-Raf, Abl and p38α.

SGI-1776 is a novel ATP competitive inhibitor of Pim1 with IC50 of 7 nM; 50- and 10-fold selective versus Pim2 and Pim3, also potent to Flt3 and haspin.

SGI-1027 is a potent and selective inhibitor of DNA methyltransferase (DNMT) with IC50 of 6, 8, 7.5 μM for DNMT1, DNMT3A, and DNMT3B, respectively.

SGC 707 is a potent allosteric inhibitor of protein arginine methyltransferase 3 (PRMT3) (IC50 = 31 nM).

SGC 0946 is a highly potent and selective DOT1L methyltransferase inhibitor with IC50 of 0.3 nM, is inactive against a panel of 12 PMTs and DNMT1.

SF1670 is a selective PTEN (phosphatase and tensin homolog) inhibitor with an IC50 of 2 micromolar.

Sertindole, a neuroleptic, is one of the newer antipsychotic medications available.

Sertaconazole nitrate is a topical broad-spectrum antifungal that is developed to provide an additional agent for the treatment of superficial cutaneous and mucosal infections.

Serotonin hydrochloride is a monoamine neurotransmitter in the CNS and an endogenous 5-HT receptor agonist. Serotonin hydrochloride is also a catechol O-methyltransferase (COMT) inhibitor with a Ki of 44 μM.

Senicapoc(ICA17043) is a potent and selective Gardos channel blocker; blocked Ca(2+)-induced rubidium flux from human RBCs/ inhibited RBC dehydration with IC50s of 11 nM/30 nM, respectively. IC50 value: 11/30 nM [1] Target: Gardos channel in vitro: I

Semaxanib (SU5416) is a potent and selective VEGFR(Flk-1/KDR) inhibitor with IC50 of 1.23 μM, 20-fold more selective for VEGFR than PDGFRβ, lack of activity against EGFR, InsR and FGFR.

Sematilide, also known as CK-1752, is a class III antiarrhythmic.