S-181 (S 181) is a specific small-molecule activator (modulator) of β-glucocerebrosidase (GCase) with AC50 of 1.49 uM and a maximum activation of 780%.

S202 is a potent, selective and brain-penetrant small molecule inhibitor of ceramide galactosyltransferase (CGT) with IC50 of 15 nM in the cell-lysate assays and 3.6 nM in intact-cell assays.

S9-A13 is a highly potent and specific inhibitor of SLC26A9, potently inhibits SLC26A9-mediated Cl−/I− and Cl−/SCN− exchange activities with IC50 of 90.9 and 171.5 nM, respectively.S9-A13 does not inhibit other members of the SLC26 family and has no effects on Cl− channels such as CFTR, TMEM16A, or VRAC.S9-A13 (0-1 uM ) inhibits SLC26A9 currents in a dose-dependent manner in HEK293 cells, but shows little effects on CFTR currents in HEK293 cells at the highest concentration (5 uM).S9-A13 has a minor effect on ion transport in human airway epithelial cells and mouse trachea, despite clear expression of SLC26A9 in the apical membrane of ciliated cells.

SACLAC is an α-chloroamide ceramide analog that binds irreversibly to acid ceramidase (ASAH1), significantly reduces the viability of AML cells (EC50=3 uM) across 30 human AML cell lines.

SAN4825 is a selective small-molecule inhibitor of cardiac ADP-ribosyl cyclase (ADPR cyclase) with IC50 of 0.13 uM.

SAR439883 (SAR 439883) is a novel potent, selective, orally active PKR inhibitor with IC50 of 0.68/0.69 uM against hPKR/mPKR, respectively.

SB1501 (SB 1501) is a bioactive compound that reduces fat accumulation by elevating mitochondrial biogenesis and fatty acid oxidation via the PGC-1α-UCP1 pathway, shows anti-obesity effects in vivo.

SBI-0802936 (SBI 0802936) is an analog of SMIP004-7, inhibits NADH:ubiquinone oxidoreductase (complex I), 4-6 times more potently than SMIP004-7, acting in the same uncompetitive fashion as SMIP004-7.

SBL-105 (SBL105) is a potent, selective DHODH inhibitor with IC50 of 48.48 nM (rh DHODH).

SBT-272 (Bevemipretide) is a brain-penetrant small molecule that stabilizes cardiolipin, a phospholipid found in inner mitochondrial membrane (IMM), thereby restoring mitochondrial structure and respiratory function.

SB-U015 is a MitoQ derivative and tumor necrosis factor receptor-associated protein 1 (TRAP1) inhibitor.

SC-919 (SC919) is a potent, selective inhibitor of IP6K (Inositol hexakisphosphate kinase) with IC50 of <5.2, <3.8 and 0.65 nM for human IP6K1/2/3, respectively.

Secdin is a small-molecule inhibitor of Arabidopsis thaliana ADP-ribosylation factor (ARF)-guanine nucleotide exchange factors (GEFs), impaires both hypocotyl and root growth in young Arabidopsis seedlings with IC50 of 4 uM.

Seletracetam (ucb 44212) is a high affinity for the synaptic vesicle protein 2A (SV2A) than levetiracetam with 10-fold, exhibits anticonvulsant properties in animal models of epilepsy.

SFI003 is novel serine/arginine-rich splicing factor 3 (SRSF3) inhibitor, inhibits the proliferation and migration of CRC cells, inhibits the proliferation of HCT-116 with IC50 of 8.78 uM.

SHR170008 is a highly potent, small molecule CD73 inhibitor with IC50 of 0.05 nM against human CD73 soluble enzyme.

A potent small-molecule inhibitor of steroid receptor coactivator-3 (SRC-3 or AIB1) that can selectively inhibit the intrinsic transcriptional activities of SRC-3, also inhibits SRC-1 and SRC-2.

Siastatin B is a potent and effective iminosugar inhibitor of diverse glycosidase classes, namely, sialidases, β-d-glucuronidases, and N-acetyl-glucosaminidases.

SJ572946 is a small molecule BAK activator, binds to the activation groove of BAK and selectively triggers BAK activation over that of BAX in liposome and mitochondrial permeabilization assays.

SMC-21598 is a specific small molecule CCL18 antagonist, binds with high-afnity on the CCL18 protein in 1:1 stoichiometry with ITC KD value of 600 nM, blocks the binding of CCL18 with its receptor PITPNM3.

SMIP004-7 is a small molecule inhibitor of mitochondrial respiration with selective in vivo anti-cancer activity, targets drug-resistant cancer cells with stem-like features by inhibiting NADH:ubiquinone oxidoreductase (complex I).

SN34960 is a small molecule Perforin inhibitor, inhibits perforin-induced lysis of Jurkat T-lymphoma cells with IC50 of 6.65 uM, shows suboptimal physicochemical properties and toxicity toward the natural killer (NK) cells that secrete perforin in vivo.