SKI II is a highly selective and non ATP-competitive S1P receptor inhibitor with IC50 of 0.5 μM, while exhibits no inhibitory on other kinases including PI3K, PKCα and ERK2.

SKQ1 prevents amyloid-beta-induced impairment of long-term potentiation in rat hippocampal slices.

SL-327 is a cell-permeable vinylogous cyanamide that acts as a selective inhibitor of MEK-1 and MEK-2 (IC50 = 0.18 and 0.22 μM respectively).

SM-164 is a bivalent mimetic of Smac with Ki values of 0.31 nM, 1.1 nM and 0.56 nM for cIAP-1, cIAP-2 and XIAP, respectively

SMER28 is a small-molecule enhancer (SMER) of autophagy, inducing autophagy independently of rapamycin in mammalian cells when supplied at 47 µM.

S-methyl-KE-298 is an active metabolite of KE-298. KE-298 inhibits matrix metalloproteinase (MMP-1) production from rheumatoid arthritis (RA) synovial cells.

SMI is considered a general-purpose activator for DNA and RNA synthesis.

SMI-16a is a selective Pim kinase inhibitor with IC50 values of 0.15, 0.02 and 48 μM for Pim1, Pim2 and PC3 cells, respectively.

SNS-062 is a non-covalently binding inhibitor of Bruton's tyrosine kinase (BTK).

Sodium Tauroursodeoxycholate (TUDC) is a water soluble bile salt, used for the treatment of gallstones and liver cirrhosis.

Solifenacin Hcl(YM905 Hcl; Vesicare Hcl) is a muscarinic receptor antagonist.

Solifenacin Succinate(YM905; Vesicare) is a muscarinic receptor antagonist.

Spautin 1 is an inhibitor of autophagy; inhibits USP10 and USP13 activity (IC50 values are 0.6 and 0.7 μM respectively) and promotes degradation of Vps34 (class III PI 3-kinase) complexes.

SPI-112Me is a prodrug for SPI-112, which preferentially inhibits the PTPase activity of Shp2 over Shp1 and PTP1B by a factor of 20 in cell-free assays.

SR-18292 is a PGC-1α inhibitor. SR-18292 reduces blood glucose, strongly increases hepatic insulin sensitivity, and improves glucose homeostasis in dietary and genetic mouse models of T2D.

SR9238 is a potent and selective LXR inverse agonist.

SRI31215 2TFA is a small molecule that acts as a triplex inhibitor of matriptase, hepsin and HGFA and mimics the activity of HAI-1/2.

SSE15206 is a microtubule depolymerizing agent that overcomes multidrug resistance.

ST034307 is a potent and selective adenylyl cyclase 1 (AC1) inhibitor, with IC50 of 2.3 μM.

Statil is shown to be a potent aldose reductase inhibitor.

STF-118804 is a highly specific NAMPT inhibitor.

STF-31 is an inhibitor of GLUT1 (IC50 = ~1 µM) that blocks glucose uptake.

STF-62247 is a small molecule agonist that induces autophagy and selectively causes lethality in renal cell carcinoma (RCC) cells that have lost the von Hippel-Lindau (VHL) tumor suppressor activity (IC50 = 625 nM).

STK321130（FLT3-IN-2）is potent FLT3 inhibitor

STO-609 is a cell-permeable inhibitor of calcium/calmodulin-dependent kinase kinases (CaMKK) isoforms CaMKKα and CaMKKβ (Ki = 80 and 15 ng/ml, respectively).

SU 4942 is a bioactive chemical.

SU 5205 is a VEGFR2 inhibitor.

SU 6656 is a selective inhibitor of Src kinases, Including Src, Yes, Lyn, and Fyn (IC50 = 280, 20, 130, 170 nM, respectively).

SU1498 is a selective inhibitor of the VEGFR2; inhibits Flk-1with an IC50 of value of 700 nM.

SU4312(NSC86429) is a selective, cell-permeable inhibitor of VEGFR2 and PDGFR tyrosine kinases (IC50s = 0.8 and 19.4 μM, respectively).