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Anastrozole Aromatase inhibitor

Name: Anastrozole
Brand: Selleck Chemicals
SKU: S1188
Availability: InStock
Rating: 5 (28 reviews)

Cat.No.S1188

Anastrozole is a third-generation nonsteroidal selective aromatase inhibitor. It may offer greater selectivity compared with other aromatase inhibitors, being without any intrinsic endocrine effects and with no apparent effect on the synthesis of adrenal steroids.

Chemical Structure

Molecular Weight: 293.37

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Quality Control

Batch: Purity: 99.99%

99.99

Related Targets	Adrenergic Receptor Estrogen/progestogen Receptor GPR Androgen Receptor Glucocorticoid Receptor ACE RAAS Progesterone Receptor Opioid Receptor THR
Other Aromatase Inhibitors	Obacunone (AI3-37934) Fadrozole (CGS16949A) alpha-Naphthoflavone

Solubility

In vitro
Batch:

DMSO : 59 mg/mL (201.11 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Ethanol : 59 mg/mL

Water : 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.	2.900mg/ml (9.89mM)	Taking the 1 mL working solution as an example, add 50 μL of 58 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.	1.400mg/ml (4.77mM)	Taking the 1 mL working solution as an example, add 50 μL of 28 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.
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.
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.
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.

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	293.37	Formula	C₁₇H₁₉N₅	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	120511-73-1	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	ZD-1033			SMILES	CC(C)(C#N)C1=CC(=CC(=C1)CN2C=NC=N2)C(C)(C)C#N

Read more about storage stability stock solution CAS number SMILES

Mechanism of Action

Targets/IC₅₀/Ki	Aromatase (human placental microsomes) 15 nM
In vitro	Anastrozole has high intrinsic potency in vitro and inhibits human placental aromatase with an IC50 of 15 nM. This compound is 200 times as potent as AG, twice as potent as 4-OHA and one third as potent as fadrozole. . This chemical inhibits aromatase by binding competitively to the hem group of the CYP unit of the enzyme thereby reducing estrogen biosynthesis in the periphery and the breast. It has little or no effect on other steroid hormones.
In vivo	Anastrozole (0.1 mg/kg) given orally to mature rats on Day 2 or 3 of the estrous cycle, blocked ovulation in mature females; in pubertal rats, the same dose given for 3 days completely blocks androstenedione-stimulated uterine development. These effects may be attributes to inhibition of the normal preovulatory rise in ovarian follicular estrogen synthesis in mature females and to inhibition of metabolism of the exogenous androstenedione by the immature ovary in prepubertal females. Twice-daily administration of >9.1 mg/kg of this compound given orally to male pigtailed monkeys inhibits peripheral aromatase, thereby reducing circulating estradiol concentrations by 50% to 60%.
References	[1] https://pubmed.ncbi.nlm.nih.gov/8903429/ [2] https://pubmed.ncbi.nlm.nih.gov/7949201/

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2025-09-29)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT07190443	RECRUITING	Breast Cancer; Locoregional Recurrence; Abemaciclib; Endocrine Therapy	Japanese Foundation for Cancer Research	2025-02-07	PHASE3
NCT05512364	RECRUITING	ER-positive Breast Cancer; HER2-negative Breast Cancer; Stage IIB Breast Cancer; Stage III Breast Cancer	European Organisation for Research and Treatment of Cancer - EORTC	2023-12-15	PHASE3
NCT06223698	NOT_YET_RECRUITING	Breast Cancer	Region Örebro County	2025-05-02	PHASE3
NCT07729046	NOT_YET_RECRUITING	Metastatic Invasive Breast Cancer; Resistant Breast Cancer; ER+, HER2-, Metastatic Breast Cancer	University of California, San Diego	2027-07	PHASE2
NCT07581834	RECRUITING	Breast Diseases; Breast Neoplasms; Dalpiciclib; Endocrine Breast Diseases; CDK4/6 Inhibitor; HR+/HER2- Breast Cancer	Fujian Cancer Hospital	2026-01-21	PHASE2
NCT07179939	NOT_YET_RECRUITING	HER2-positive Breast Cancer	Fudan University	2025-09-10	PHASE2

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