Catalog No. Size PriceQuantity
M7465-2 2mg solid $100
M7465-10 10mg solid $300


AT-56 is an orally active and selective inhibitor of lipocalin-type prostaglandin (PG) D synthase (L-PGDS) with Ki of 75 μM and IC50 of 95 μM.

Product information

CAS Number: 162640-98-4

Molecular Weight: 397.52

Formula: C25H27N5

Chemical Name: 4-(5H-dibenzo[a,d]cyclohepten-5-ylidene)-1-[4-(2H-tetrazol-5-yl)butyl]-piperidine



InChi: InChI=1S/C25H27N5/c1-3-9-22-19(7-1)12-13-20-8-2-4-10-23(20)25(22)21-14-17-30(18-15-21)16-6-5-11-24-26-28-29-27-24/h1-4,7-10,12-13H,5-6,11,14-18H2,(H,26,27,28,29)

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: DMSO 80 mg/mL (201.25 mM)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined

HS Tariff Code: 382200

How to use

In Vitro:

AT-56 inhibits human and mouse L-PGDSs in a concentration (3–250 μm)-dependent manner. AT-56 inhibits the L-PGDS activity in a competitive manner against the substrate PGH2 (Km = 14 μm) with a Ki value of 75 μm. AT-56 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 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.


  1. Daisuke Irikura, et al. J Biol Chem. 2009 Mar 20;284(12):7623-3

Products are for research use only. Not for human use.

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