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OTR-AC (MK-2866 ESTER)

$79.99
$129.99
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)

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Selected Product

Due to Licensing and Regulatory constraints, we are unable to provide any advice or guidance on how to use or conduct research with these products. The products offered on our website are intended solely for in-vitro studies. In-vitro studies (Latin: "in glass") are performed outside of the body.


We encourage you to conduct your own research using resources such as Google. Most of the answers to your questions can be found on the internet. While we cannot provide specific answers, we can assure you that we provide legitimate, lab-tested, and high-quality products.

   1. Product Overview 

OTR-AC (also called MK-2866 Ester or Ostarine-O-Acetate) is the esterified form of Ostarine (MK-2866). Lawless Labs offers it in these research-grade formats:

  1. Tincture – 10 mg/mL, 30 mL PEG-based solution 
  2. Capsules – 60 capsules, 250 µg each 
    3. Raw Powder – 1,000 mg pure crystalline OTR-AC  

All products are packaged to protect integrity and stored away from heat, light, and moisture.

   2. Chemical & Physical Data

CAS:

1025658-44-9 

Molecular Formula:

C₂₁H₁₆F₃N₃O₄ 

Molar Mass:

431.37 g/mol 

Appearance:

White to off-white crystalline powder (capsules/raw) or clear solution (tincture)

Melting Point:

175–179 °C (spec listings) 

Solubility:

Soluble in DMSO, ethanol, PEG-400; sparingly soluble in water 

Synonyms:

OTR-AC, Ostarine acetate, Ostarinyl acetate, MK-2866 ester 

   3. Research Significance

Esterification to OTR-AC is studied for potentially extended activity/half-life vs. parent MK-2866 while retaining selective AR modulation after hydrolysis—useful for comparative SARM/prodrug research. 

   4. Available Formats & Benefits

Tincture
10 mg per ML
30ml per bottle

Key Benefits
Ready-to-use liquid for accurate stock preparation and micro-dosing workflows

Capsules
250 µg  per capsule
60 caps per bottle

Key Benefits

Micro-dose, pre-measured format minimizes handling and supports consistency.

Raw Powder
1,000mg pure crystalline 
 

Key Benefits

Maximum flexibility for custom formulations, bulk work, and method development.

   5. Product Usage

Due to Licensing and Regulatory constraints, we are unable to provide any advice or guidance on how to use or conduct research with these products. The products offered on our website are intended solely for in-vitro studies. In-vitro studies (Latin: "in glass") are performed outside of the body.

We encourage you to conduct your own research using resources such as Google. Most of the answers to your questions can be found on the internet. While we cannot provide specific answers, we can assure you that we provide legitimate, lab-tested, and high-quality products.

   6. Storage & Stability

Format

Recommended Storage

Stability

Powder

Tincture

Capsules

–20 °C (freezer)

Cool, dry place 

Cool, dry place

Stable ≥4 years

Stable ≥4 years

Stable ≥4 years

   7. Lab Results

Mutliple Format Selection 
for research flexibility

Verified Purity 
with published third party results

Secure Packaging 
to protect stability and integrity

Transparent Chemical Data 
for accurate lab documentation

Trusted Brand 
with more than 50,000 successful deliveries to researchers worldwide

All Products

OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)
OTR-AC (MK-2866 ESTER)

OTR-AC (MK-2866 ESTER)

$79.99
$129.99

Select Product Type

Selected Product
Quantity
View Lab Results
CHOOSE PRODUCT TYPE

Due to Licensing and Regulatory constraints, we are unable to provide any advice or guidance on how to use or conduct research with these products. The products offered on our website are intended solely for in-vitro studies. In-vitro studies (Latin: "in glass") are performed outside of the body.


We encourage you to conduct your own research using resources such as Google. Most of the answers to your questions can be found on the internet. While we cannot provide specific answers, we can assure you that we provide legitimate, lab-tested, and high-quality products.

1. Product Overview

2. Chemical & Physical Data

3. Research Significance

4. Available Formats & Benefits

5. Product Usage

6. Storage & Stability

7. Lab Results

1. Product Overview

OTR-AC (also called MK-2866 Ester or Ostarine-O-Acetate) is the esterified form of Ostarine (MK-2866). Lawless Labs offers it in these research-grade formats:

  1. Tincture – 10 mg/mL, 30 mL PEG-based solution 
  2. Capsules – 60 capsules, 250 µg each 
    3. Raw Powder – 1,000 mg pure crystalline OTR-AC  

All products are packaged to protect integrity and stored away from heat, light, and moisture.

2. Chemical & Physical Data

CAS:

1025658-44-9 

Molecular Formula:

C₂₁H₁₆F₃N₃O₄ 

Molar Mass:

431.37 g/mol 

Appearance

White to off-white crystalline powder (capsules/raw) or clear solution (tincture)

Melting Point:

175–179 °C (spec listings) 

Solubility:

Soluble in DMSO, ethanol, PEG-400; sparingly soluble in water 

Synonyms:

OTR-AC, Ostarine acetate, Ostarinyl acetate, MK-2866 ester 

Back to Top

3. Research Significance

Esterification to OTR-AC is studied for potentially extended activity/half-life vs. parent MK-2866 while retaining selective AR modulation after hydrolysis—useful for comparative SARM/prodrug research. 

Back to Menu

4. Available Formats & Benefits

Tincture

10mg per ML
30ml per bottle

Capsule

250 µg per capsule
60 caps per bottle

Raw Powder

1,000mg pure crystalline powder per container

Key Benefits

Ready-to-use liquid for accurate stock preparation and micro-dosing workflows. 

Key Benefits

Micro-dose, pre-measured format minimizes handling and supports consistency. 

Key Benefits

Maximum flexibility for custom formulations, bulk work, and method development.

Back to Top

5. Product Usage

Due to Licensing and Regulatory constraints, we are unable to provide any advice or guidance on how to use or conduct research with these products. The products offered on our website are intended solely for in-vitro studies. In-vitro studies (Latin: "in glass") are performed outside of the body.

 

We encourage you to conduct your own research using resources such as Google. Most of the answers to your questions can be found on the internet. While we cannot provide specific answers, we can assure you that we provide legitimate, lab-tested, and high-quality products.

Back to Top

6. Storage & Stability

Format

Recommended Storage

Stability

Powder

–20 °C (freezer)

Stable ≥4 years

Tincture

Cool, dry place 

Stable ≥4 years

Capsules

Cool, dry place

Stable ≥4 years

Back to Top

7. Lab Results

Back to Top

Product Description

VIAL: 5MG

This product comes in a lyophilized (freeze-dried) powder form. To reconstitute it into a liquid form, mix with Bacteriostatic Reconstitution Water, which can be purchased HERE

Capsules: 60

Each bottle contains 60 capsules, with 250 mcg per capsule

 

Note: Please select either the vial or the capsules at checkout, as they are two different forms of the product.

Product Usage

Due to Licensing and Regulatory constraints, we are unable to provide any advice or guidance on how to use or conduct research with these products. The products offered on our website are intended solely for in-vitro studies. In-vitro studies (Latin: "in glass") are performed outside of the body. 

 

We encourage you to conduct your own research using resources such as Google. Most of the answers to your questions can be found on the internet. While we cannot provide specific answers, we can assure you that we provide legitimate, lab-tested, and high-quality products.

FREE Shipping on all orders!

 

Availability: Ships today if ordered and paid by 12 PM CST

(Excluding Saturday and Sunday)

Title

Don't Forget to Add!

30 ml Bacteriostatic Water

Mutliple Format Selection 
for research flexibility

Verified Purity 
with published third party results

Secure Packaging 
to protect stability and integrity

Transparent Chemical Data 
for accurate lab documentation

Trusted Brand 
with more than 50,000 successful deliveries to researchers worldwide

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