ATR-101 HCl

    WARNING: This product is for research use only, not for human or veterinary use.

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.

Chemical Structure

ATR-101 HCl
CAS# 133825-81-7 (HCl)

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

Price and Availability

Size Price Availability Quantity
5.0mg USD 280.0 2 Weeks
25.0mg USD 855.0 2 Weeks
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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


Appearance: Solid powder

Purity: >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).

Solubility: 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: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 458.09 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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 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.


Additional Information

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

Note: Structure of ATR-101 was from WO2013142214 A1