Name: AT-56
Brand: Selleck Chemicals
SKU: S9678
Availability: InStock
Rating: 5 (1 reviews)

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Batch: S967801 DMSO]80 mg/mL]false]Water]Insoluble]false]Ethanol]Insoluble]false Purity: 98.52%

Cited in Nature Medicine for its top-tier quality
COA
NMR
SDS/MSDS
Datasheet

98.52

Related Targets	Dehydrogenase HSP Transferase P450 (e.g. CYP17) PDE phosphatase PPAR Vitamin Carbohydrate Metabolism Mitochondrial Metabolism
Featured Inhibitors	Y-27632 Dihydrochloride SB431542 CHIR-99021 (Laduviglusib) RMC-7977 RMC-6236 (Daraxonrasib) MRTX1133 MG132 Z-VAD-FMK VT3989 IAG933

Solubility

In vitro
Batch:

DMSO : 80 mg/mL (201.24 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	4mg/ml (10.06mM)	Taking the 1 mL working solution as an example, add 50 μL of 80 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution	5% DMSO 1 95% Corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.57mg/ml (1.43mM)	Taking the 1 mL working solution as an example, add 50 μL of 11.4 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

Dosage: mg/kg

Average weight of animals: g

Dosing volume per animal: μL

Number of animals:

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO

%

% Tween 80

% ddH₂O

% DMSO

+

%

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight	397.52	Formula	C₂₅H₂₇N₅	Storage (From the date of receipt)	3 years -20°C powder
CAS No.	162640-98-4	--		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	N/A			SMILES	C1CN(CCC1=C2C3=CC=CC=C3C=CC4=CC=CC=C42)CCCCC5=NNN=N5

Read more about storage stability stock solution CAS number SMILES

Mechanism of Action

Targets/IC₅₀/Ki	L-PGDS (Cell-free assay) 75 μM(Ki) L-PGDS (Cell-free assay) 95 μM
In vitro	AT-56 inhibits human and mouse L-PGDSs in a concentration (3–250 μm)-dependent manner. This compound inhibits the L-PGDS activity in a competitive manner against the substrate PGH2 (Km = 14 μm) with a Ki value of 75 μm. It inhibits the production of PGD2 by L-PGDS-expressing human TE-671 cells after stimulation with Ca2+ ionophore (5 μm A23187) with an IC50 value of about 3 μm without affecting their production of PGE2 and PGF2α.
In vivo	Orally administered AT-56 (<30 mg/kg body weight) decreases the PGD2 production to 40% in the brain of H-PGDS-deficient mice after a stab wound injury in a dose-dependent manner without affecting the production of PGE2 and PGF2α and this compound also suppresses the accumulation of eosinophils and monocytes in the bronco-alveolar lavage fluid from the antigen-induced lung inflammation model of human L-PGDS-transgenic mice.
References	[1] https://pubmed.ncbi.nlm.nih.gov/19131342/

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2025-06-22)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT05132166	ACTIVE_NOT_RECRUITING	Graft Vs Host Disease	University Health Network, Toronto	2021-12-22	PHASE2
NCT05102123	Recruiting	Smoking (Tobacco) Addiction\|Smoking Cessation	Population Health Research Institute	2024-01-15	Phase 3
NCT05707208	Recruiting	Chronic Pain	Sustained Therapeutics Inc.	2023-03-21	Phase 2
NCT04102800	Completed	Asthma	NHS Greater Glasgow and Clyde\|University of Glasgow\|AstraZeneca\|Queen''s University Belfast\|Bosch Healthcare Solutions GmbH\|InHealthcare\|University of Leicester\|University of Plymouth\|Vitalograph	2019-09-30	Phase 4
NCT03005379	Terminated	Clostridium Difficile Infection	VA Office of Research and Development	2018-11-15	Phase 2\|Phase 3

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AT-56 PGDS inhibitor

Chemical Structure

Molecular Weight: 397.52