ATR-101 HCl

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MedKoo CAT#: 206150

CAS#: 133825-81-7 (HCl)

Description: ATR-101, also known as PD-132301 (a free base) or PD-132301-2 (a HCl salt), is in clinical development for the treatment of adrenocortical carcinoma (ACC). ATR-101 is a selective inhibitor of ACAT1 (acyl coenzyme A:cholesterol acyltransferase). ACAT1 catalyzes cholesterol ester formation and, in the adrenals, is particularly important in creating a reservoir of substrate for steroid biosynthesis. ATR-101 is uniquely distributed to adrenal tissues and inhibition of adrenal ACAT1 by ATR-101 disrupts steroidogenesis and leads to selective apoptosis of steroid producing adrenocortical-derived cells. Similar effects have been seen in the human ACC cell line, H295R. ATR-101 has shown pre-clinical efficacy in H295R xenograft mouse models. ACC is an ultra-rare malignancy, occurring in about 2 per million population annually.

Price and Availability

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Pricing updated 2020-08-09. Prices are subject to change without notice.

ATR-101 HCl, purity > 98%, is not in stock, may be available through custom synthesis. For cost-effective reason, minimum 1 gram order is requested. The product will be characterized by NMR, HPLC and MS analysis. Purity (HPLC) is usually >98%. CoA, QC data, MSDS will be provided when product is successfully made. The estimated lead time is 2-3 months. Please send email to to inquire quote.

Chemical Structure


Theoretical Analysis

MedKoo Cat#: 206150
Name: ATR-101 HCl
CAS#: 133825-81-7 (HCl)
Chemical Formula: C27H40ClN3O
Exact Mass:
Molecular Weight: 458.09
Elemental Analysis: C, 70.79; H, 8.80; Cl, 7.74; N, 9.17; O, 3.49

Related CAS #: 133825-81-7 (HCl)   133825-80-6 (free base)      

Synonym: ATR-101; ATR 101; ATR101; ATR-101 HCl; ATR-101 hydrochloride; PD132301-2; PD-132301-2; PD 132301-2; PD132301; PD-132301; PD 132301.

IUPAC/Chemical Name: 1-(2,6-diisopropylphenyl)-3-((1-(4-(dimethylamino)phenyl)cyclopentyl)methyl)urea hydrochloride


InChi Code: InChI=1S/C27H39N3O.ClH/c1-19(2)23-10-9-11-24(20(3)4)25(23)29-26(31)28-18-27(16-7-8-17-27)21-12-14-22(15-13-21)30(5)6;/h9-15,19-20H,7-8,16-18H2,1-6H3,(H2,28,29,31);1H


Technical Data

Solid powder

>98% (or refer to the Certificate of Analysis)

Shipping Condition:
Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition:
Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Soluble in DMSO, not in water

Shelf Life:
>2 years if stored properly

Drug Formulation:
This drug may be formulated in DMSO

Stock Solution Storage:
0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code:

Additional Information

133825-81-7 (ATR-101 HCl)
133825-80-6 (ATR-101).  

Note: Structure of ATR-101 was from WO2013142214 A1


 1: Wolfgang GH, MacDonald JR, Vernetti LA, Pegg DG, Robertson DG. Biochemical alterations in guinea pig adrenal cortex following administration of PD 132301-2, an inhibitor of acyl-CoA:cholesterol acyltransferase. Life Sci. 1995 Feb 17;56(13):1089-93. PubMed PMID: 9001442.

2: Saxena U, Ferguson E, Newton RS. Acyl-coenzyme A:cholesterol-acyltransferase (ACAT) inhibitors modulate monocyte adhesion to aortic endothelial cells. Atherosclerosis. 1995 Jan 6;112(1):7-17. PubMed PMID: 7772069.

3: Reindel JF, Dominick MA, Bocan TM, Gough AW, McGuire EJ. Toxicologic effects of a novel acyl-CoA:cholesterol acyltransferase inhibitor in cynomolgus monkeys. Toxicol Pathol. 1994 Sep-Oct;22(5):510-8. PubMed PMID: 7899779.

4: Krause BR, Black A, Bousley R, Essenburg A, Cornicelli J, Holmes A, Homan R, Kieft K, Sekerke C, Shaw-Hes MK, et al. Divergent pharmacologic activities of PD 132301-2 and CL 277,082, urea inhibitors of acyl-CoA:cholesterol acyltransferase. J Pharmacol Exp Ther. 1993 Nov;267(2):734-43. PubMed PMID: 8246149.

5: Dominick MA, McGuire EJ, Reindel JF, Bobrowski WF, Bocan TM, Gough AW. Subacute toxicity of a novel inhibitor of acyl-CoA: cholesterol acyltransferase in beagle dogs. Fundam Appl Toxicol. 1993 Feb;20(2):217-24. PubMed PMID: 8383621.

6: Dominick MA, Bobrowski WA, MacDonald JR, Gough AW. Morphogenesis of a zone-specific adrenocortical cytotoxicity in guinea pigs administered PD 132301-2, an inhibitor of acyl-CoA:cholesterol acyltransferase. Toxicol Pathol. 1993;21(1):54-62. PubMed PMID: 8397438.