L-Arginine is the nitrogen donor for synthesis of nitric oxide, a potent vasodilator that is deficient during times of sickle cell crisis.

Lapatinib ditosylate(GW-572016 ditosylate) is a potent EGFR and ErbB2 inhibitor with IC50 of 10.8 and 9.2 nM, respectively.

Lansoprazole(AG 1749) is a proton pump inhibitor which prevents the stomach from producing acid.

Lanperisone (NK 433) is a centrally acting muscle relaxant that selectively kills of K-ras mutant cancer cells in a cell cycle-independent fashion.

Landiolol Hydrochloride

Lamotrigine(BW430C) is a novel anticonvulsant drug for inhibition of 5-HT and sodium channel.

Lafutidine

LAF389 is a potent methionine aminopeptidase (MetAP) inhibitor with IC50 of 800 nM for MetAP-2, inhibits both MetAp1 and 2, potently inhibits HUVEC proliferation with IC50 of 20 nM.

Lactulose (Enulose)

Lactimidomycin is a glutarimide antibiotic that has antifungal, antiviral and anti-cancer properties, acting as a direct inhibitor of protein translation in ribosomes.

Lacidipine (Lacipil, Motens) is a L-type calcium channel blocker.

L-826,266 is a potent and selective competitive antagonist of the prostaglandin E2 receptor subtype EP3 (Ki = 0.8 nM).

L-364373 (R-L3) is a stereospecific activator of cardiac slowly activating delayed rectifier K+ current (IKs) and KV7.1 (KCNQ1) channels.

L-338192 is a small molecule inhibitor that effectively inhibits the β-catenin/Tcf4 interaction with Ki of 29 uM in AlphaScreen assay.

L-291 (DDAH-1 inhibitor L-291) is a selective, competitive DDAH1 inhibitor with IC50 of <25 uM.

L-257 (DDAH-1 inhibitor L-257) is a selective, competitive DDAH1 inhibitor with IC50 of <25 uM.

L(+)-Rhamnose Monohydrate

L-(-)-α-Methyldopa hydrate is an alpha-adrenergic agonist (selective for α2-adrenergic receptors) psychoactive drug used as a sympatholytic or antihypertensive.

L 873724 is a potent and selective non-basic cathepsin K inhibitor with IC50 of 0.2 nM, shows no significant potency against Cat B, L, and S (IC50= 5239, 264, and 178 nM).

KZR-504 is a highly selective and orally active inhibitor of immunoproteasome low molecular mass polypeptide 2 (LMP2), with IC50s of 51 nM, 4.274 μM for LMP2 and LMP7, respectively.

Kynurenic acid, a natural metabolite of tryptophan via the kynurenine pathway, is a broad-spectrum excitatory amino acid antagonist.

KY-04045 is a novel PAK4 inhibitor with IC50 of 8.7 uM, a basic building block in designing novel imidazo[4,5-b]pyridine-based PAK4 inhibitors..

KY-02327 is an orally active, small molecule inhibitor of the Dishevelled (Dvl)-CXXC5 interaction with IC50 of 3.1 uM, a metabolically stabilized KY-02061 analog.

KY-02061 is a small-molecule inhibitor of Dishevelled-CXXC5 interaction with IC50 of 24 uM in vitro binding assay.

KX2-361 (KX 02) is a potent, dual Src signaling/tubulin polymerization inhibitor that are under clinical evaluation..

KuWal151 is a potent, selective cdc2-like kinase (CLK) inhibitor with IC50 of 88/510/28 nM for CLK1/2/4, respectively.

KU14R is a new I(3)-R antagonist, which selectively blocks the insulin secretory response to imidazolines.

KU-0063794 is a potent and highly specific mTOR inhibitor for both mTORC1 and mTORC2 with IC50 ~10 nM.

KT-5720 is a highly specific PKA (cAMP-dependent protein kinase) inhibitor with Ki of 60 nM displays little to no activity for MLCK, cGPK, and PKC (Ki>2 uM).

KT-195 is a potent and selective inhibitor of serine hydrolase ABHD6 (α/β-hydrolase domain-containing protein 6) with IC50 of 10 nM.