SR3335 (ML-176) is a selective RORα synthetic ligand, directly binds to RORα, but not other RORs, and functions as a selective partial inverse agonist of RORα in cell-based assays.

SR-12813 is a pregnane X receptor (PXR) agonist.

SR 3029 is a potent and highly specific CK1δ/CK1ε inhibitor with the IC50 of 97 nM.

SR 0987 is an agonist of the T cell-specific isoform of RORγ (RORγt, retinoic acid receptor-related orphan receptor-γt), inducing reporter gene expression with an EC50 value of ~800 nM.

SQ 22536 is a inhibitor of adenylyl cyclase (IC50 = 1.4 μM).

SPI 112 is novel Shp2 PTP inhibitor.

SP600125 is a broad-spectrum JNK inhibitor for JNK1, JNK2 and JNK3 with IC50 of 40 nM, 40 nM and 90 nM, respectively.

SP-420 is an orally active small molecule that selectively binds iron and removes it from the body. SP-420 has shown excellent tissue penetration, highly efficient iron binding and a promising safety profile.

SP2509 is a novel histone demethylase LSD1 (KDM1A) antagonist with IC50 of 13 nM; no inhibition on MAO-A and MAO-B.

Sotrastaurin(AEB-071) is a potent and selective pan-PKC inhibitor, mostly for PKCθ with Ki of 0.22 nM; inactive to PKCζ.

Sorafenib(BAY 43-9006) is a potent inhibitor of Raf-1 with IC50 values of 6 nM, 22 nM and 90 nM for Raf-1, B-Raf, and VEGFR2 respectively, BAY 43-9006 suppresses both wild-type and V599E mutant BRAF activity in vitro.

Sorafenib Tosylate (Bay 43-9006, Nexavar) is a multikinase inhibitor of Raf-1, B-Raf and VEGFR-2 with IC50 of 6 nM, 22 nM and 90 nM, respectively.

Solithromycin is a novel ketolide antibiotic.

Solcitinib, also known as GSK2586184 or GLPG0778, is a Janus kinase 1 (JAK1) inhibitor.

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.

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.