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Catalog No.
Hsp90 inhibitor
Grouped product items
SizePriceStock Qty
10mM (in 1mL DMSO)
In stock
In stock
In stock
In stock
In stock

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Email: [email protected]

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AT13387, discovered by a high-throughput x-ray craystallography fragment-based platform, is a non-geldanamycin heat shock proterin 90 (HPS90), a molecule chaperone regulating signal transduction pathways for cell growth and survival, inhibitor reportedly resulting in client protein degradation, suppression of signaling, and inducing cell cycle arrest and apoptosis. Since structurally unrelated to geldanamycin, it has high affinity for binding HSP90 (Kd = 0.5nM) and exhibited an in vitro cytotoxicity showing a median EC50 value of 41 nM. A long tumor-specific retention was observed in AT13387 during xenograft  studies, which indicated the possibility of less frequent dosing. However, preliminary results showed that the antitumor activity of AT13387 against solid tumor and leukemia models is similar to alvespimycin.


Min H. Kang, C. Patrick Reynolds, Peter J. Houghton, Denise Alexander, Christopher L. Morton, E. Anders Kolb, Richard Gorlick, Stephen T. Keir, Hernan Carol, Richard Lock, John M. Maris, Amy Wozniak, and Malcolm A. Smith. Initial Testing (Stage 1) of AT13387, an HSP90 Inhibitor, by the Pediatric Preclinical Testing Program. Pediatr Blood Cancer. 2012; 59(1): 185-188

Chemical Properties

Physical AppearanceA solid
StorageStore at -20°C
Cas No.912999-49-6
Solubilityinsoluble in H2O; ≥13.25 mg/mL in DMSO; ≥47.7 mg/mL in EtOH with ultrasonic
Chemical Name(2,4-dihydroxy-5-propan-2-ylphenyl)-[5-[(4-methylpiperazin-1-yl)methyl]-1,3-dihydroisoindol-2-yl]methanone
SDFDownload SDF
Canonical SMILESCC(C)C1=C(C=C(C(=C1)C(=O)N2CC3=C(C2)C=C(C=C3)CN4CCN(CC4)C)O)O
Shipping ConditionEvaluation sample solution: ship with blue ice. All other available sizes: ship with RT, or blue ice upon request.
General tipsFor obtaining a higher solubility, please warm the tube at 37°C and shake it in the ultrasonic bath for a while. Stock solution can be stored below -20°C for several months.

Biological Activity

Description AT13387 is a synthetic, orally bioavailable and small-molecule inhibitor of heat shock protein 90 (Hsp90) with IC50 value of 18 nM in A375 cells.
Targets Hsp90          
IC50 18 nM (in A375 cells)          

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