Losoxantrone hydrochloride (CI 941 hydrochloride) is a DNA-binding agent. Losoxantrone hydrochloride has broad-spectrum antitumour activity. Losoxantrone hydrochloride induces dose-dependent leukopenia.

Lortalamine (LM 1404) is a selective norepinephrine transporter inhibitor with an IC50 of <1 nM. Lortalamine is a non-tricyclic antidepressant. Lortalamine antagonises Reserpine-induced ptosis and hypothermia. Lortalamine inhibits norepinephrine uptake.

L-Kynurenine-5-F (Compound 2h) is the 5-F derivative of L-Kynurenine.

Lixazinone (RS-82856) hydrogensulfate is a selective inhibitor of cGMP-inhibited phosphodiesterase (PDE3) with an IC50 value of 22 nM. Lixazinone hydrogensulfate exhibits positive inotropic effects, afterload reduction and antithrombotic properties. Lixazinone hydrogensulfate increases cyclic adenosine monophosphate (cAMP) levels in human platelets, inhibits thrombin-induced aggregation of human platelets, and blocks the photolabeling of PDE3 active sites by [32P]cGMP. Lixazinone hydrogensulfate can be used in the research of polycystic kidney disease and congestive heart failure.

LIQ1, a flavonoid derivative, is a potent Pyruvate kinase M2 (PKM2) allosteric inhibitor (IC50 = 0.39 μM; Kd = 4.5 μM) targeting Arg43 within the polyarginine pocket. LIQ1 exhibits efficacy in a mouse model of LPS-induced endotoxemia, preventing the nuclear translocation of PKM2 and inhibiting its binding to HIF-1α, thereby suppressing IL-1β transcription. LIQ1 can be used for the research of endotoxemia[1].

LG190155 is a nonsteroidal vitamin D receptor (VDR) agonist. LG190155 activates VDR in mesenchymal stem cells, thereby upregulating the BMP6-IL6 autocrine axis. Pretreatment of mesenchymal stem cells with LG190155 significantly enhances their ability to induce differentiation of acute myeloid leukemia cells, without inducing hypercalcemia. LG190155 is applicable to research related to acute myeloid leukemia (AML).

Leu-PEG1-Dasa is a potent BCR-ABL PROTAC degrader with a DC50 of 0.48 nM. Leu-PEG1-Dasa uses a single amino acid as the E3 ligand and belongs to a mini-PROTAC, functioning through the N-terminal canonical pathway. Leu-PEG1-Dasa exhibits potent anti-proliferative activity against K562 cells. Leu-PEG1-Dasa can be used for the study of chronic myeloid leukemia (CML). (Pink: Bcr-Abl ligand ; Blue: Ligands for E3 Ligase ligand ; Black: linker).

Lerimazoline is a selective 5-HT1D receptor agonist with Ki values of 72 and 3480 nM for h5-HT1D and h5-HT1B. Lerimazoline inhibits Forskolin-stimulated cAMP production and induces contractions in rabbit saphenous vein preparations. Lerimazoline can be used for the research of migraine.

L-Dopachrome is a nucleoside metabolite.

LDH-IN-5 is a Lactate Dehydrogenase (LDH) inhibitor with neuroprotective activity. LDH-IN-5 can inhibit cell apoptosis, reduce ROS, MDA production and increases superoxide dismutase (SOD) activity. LDH-IN-5 can be used for the research of neurological disease, such as ischemic stroke.

LCK degrader-3 (Compound 20) is a CRBN-based LCK molecular glue degrader. LCK degrader-3 can be used in the research of acute lymphoblastic leukemia.

LCI133 is afirst-in-class,nanomolar-potent, selective multikinase inhibitor targeting CDK4/6/9 and AURKA/B (IC50 = 4.7/10.2/4.1 nM and 2.8/10.6 nM). LCI133 induces S/G2 cell-cycle arrest and robust apoptosis in MYCN-amplified neuroblastoma BE(2)-C cells. LCI133 demonstrates significant antitumor efficacy in a BE(2)-C neuroblastoma xenograft model.

LCB-2183 is an orally active antiallergic agent. LCB-2183 can inhibit tracheal hyperreactivity and pulmonary inflammation in mouse airways.

LCB-2122 is an adenosine-like nucleoside analogue bearing a C2'-stereogenic all-carbon quaternary center. LCB-2122 can prevent Doxorubicin-induced cardiomyocytes apoptosis with an IC50 of 0.5 μM and prevent Imatinib-induced apoptosis. LCB-2122 can activate AMPK signaling and induce the phosphorylation of AMPK and its downstream substrate, acetyl-CoA carboxylase (ACC). LCB-2122 can reduce Doxorubicin-induced mitochondrial damage. LCB-2122 can be used for the research of heart failure.

LC-61 is a potent antileishmanial agent with an IC50 of 0.076 µM against intracellular L. infantum.

Lazertinib (YH25448; GNS-1480) mesylate hydrate is an orally active, blood-brain barrier permeable third-generation EGFR tyrosine kinase inhibitor, as well as an ABCB1/ABCG2 inhibitor and a TRPA1 activator. Lazertinib mesylate hydrate exhibits IC50 values of 0.4 mM and 0.2 mM against human ABCB1 and ABCG2, respectively. By inhibiting mutant EGFR signaling, EGFR phosphorylation and the downstream ERK/AKT pathway, as well as upregulating surface expression of EGFR/MET, Lazertinib mesylate hydrate induces cell cycle arrest, apoptosis, spontaneous calcium responses, hyperexcitability of dorsal root ganglion (DRG) neurons, and TRPA1-dependent pain-like behaviors. Lazertinib mesylate hydrate competitively binds to the substrate-binding sites of ABCB1/ABCG2, stimulates their ATPase activity without altering their expression or plasma membrane localization, thereby enhancing ADCC activity, acting as a chemosensitizer, and reversing ABCB1-mediated multidrug resistance. It exerts antitumor activity as a single agent or in combination with other drugs. Lazertinib mesylate hydrate is applicable to research related to non-small cell lung cancer, multidrug-resistant cancers, and paresthesia.

LASSBio-2389 is a selective ROCK2 inhibitor with an IC50 of 0.051 μM and an IC50 of 1.143 μM against ROCK1. LASSBio-2389 reduces the viability of MDA-MB-231 cells and inhibits cell migration. LASSBio-2389 is applicable to the research of triple-negative breast cancer.

LasB-IN-3 is a protease elastase (LasB) inhibitor of Pseudomonas aeruginosa with an IC50 value of 8.5 nM. LasB-IN-3 shows an IC50 of 58.9 nM for the Met128Val mutant. LasB-IN-3 binds to active sites of wild-type and Met128Val mutant LasB, coordinates zinc ions, forms hydrogen bonds and CH-π interactions, and inhibits LasB proteolytic activity. LasB-IN-3 increases survival rate in LasB-induced acute lung injury mice models. LasB-IN-3 can be used for the research of Pseudomonas aeruginosa infection.

Largazole thiol, the active form of Largazole, is a potent, selective and brain-penetrant class I HDAC inhibitor. Largazole thiol. Largazole thiol exerts antitumor and neuroprotective effects. Largazole thiol can be used for research of Glioblastoma.

Lantadene B is a triterpene component. Lantadene B can be isolated from the red variety of Lantana Camara. Lantadene B can be used in the research of cancer and inflammatory diseases.

Lanopepden camsylate (GSK1322322 camsylate) is a high-affinity bacterial peptide deformylase inhibitor. Lanopepden camsylate is applicable to research related to bacterial infections.

Lamivudine triphosphate (3TCTP) TEA is a phosphorylated Lamivudine (a nucleoside analogue). Lamivudine triphosphate TEA inhibits the reverse transcriptase of HIV or HBV viruses to block viral replication by chain termination. Lamivudine triphosphate TEA is also an inhibitor of the RdRp activity of the NS5B subunit of the HCV. Lamivudine triphosphate TEA can be incorporated into the nascent RNA by the SARS-CoV-2 RdRp, thus halting mutations in the nascent SARS-CoV-2 RNA.

L-4-Aminoarabinose-bactoprenyl phosphate (L-4-Aminoarabinose-BP) is a substrate of the ArnT enzyme and participates in lipid A modification through covalent bonding. L-4-Aminoarabinose-bactoprenyl phosphate transfers L-4-aminoarabinose (Ara4N) to the lipid A portion of lipopolysaccharide (LPS), mediating cationic modification of lipid A, thereby conferring resistance to cationic antimicrobial peptides (CAMPs) in Gram-negative bacteria. L-4-Aminoarabinose-bactoprenyl phosphate is an endogenous intermediate synthesized in vivo by a series of enzymes such as ArnC and ArnD encoded by the arn operon in Gram-negative bacteria such as Escherichia coli.

L-163958 is an efficient, orally active, balanced angiotensin II receptor (AII receptor) antagonist. L-163958 has balanced high affinity for AT1 and AT2, with its IC50 values being 0.16, 0.12, 0.50, and 0.64 nM in rabbit aorta (AT1), rat midbrain (AT2), human adrenal gland (AT1), and human adrenal gland (AT2), respectively. L-163958 has a strong inhibitory effect on the pressor activity in rats. L-163958 can be used for the study of hypertension and related cardiovascular diseases.

KY0418 is a selective GPX4 inhibitor. KY0418 selectively and covalently modifies the selenocysteine residue of GPX4 and inhibits GPX4 activity. KY0418 induces ferroptosis and suppresses cell proliferation. KY0418 can be used for the study of ferroptosis and cancer.

Kv7.2/Kv7.3 modulator-3 (example 40 peak-1) is a selective Kv7.2/Kv7.3 modulator with an EC50 of 0.099 μM.

KV1.3-IN-2 hydrochloride is a kv1.3 potassium channel inhibitor without affecting hERG channel activity. KV1.3-IN-2 hydrochloride can be used in research of immune-related diseases such as psoriasis, rheumatoid arthritis, and systemic lupus erythematosus.

KTT-1 is a kinetically selective and orally active HDAC2 inhibitor. KTT-1 exhibits high HDAC2-selectivity over HDAC1. KTT-1 inhibits osteoclast differentiation at an early stage by downregulating c-Fos expression. KTT-1 effectively suppresses arthritis symptoms in the collagen-induced arthritis (CIA) mouse model. KTT-1 can be used for the research of rheumatoid arthritis and neurodegenerative diseases.

KT-474 (KYM-001; PROTAC IRAK4 degrader-7) hydrochloride is an orally active PROTAC IRAK4 degrader with anti-tumor effects. KT-474 inhibits the cell cycle and induces apoptosis. KT-474 induces tumor regression in a xenograft model of MYD88-mutated ABC DLBCL. KT-474 is a click chemistry reagent, containing an alkyne group, which can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing azide groups.

KSP-IN-2 (compound 12) is a kinesin spindle protein (KSP) inhibitor with an IC50 of 450 nM.