Description

17α-Ethynyl-18-Methylestra-3,5-Diene-3,17β-Diol Diacetate is a high-purity synthetic steroid derivative, also known by its CAS number 13635-15-9. This compound is valued for its role as a critical intermediate in the synthesis of more complex, biologically active steroid molecules. It is primarily required by pharmaceutical R&D laboratories and fine chemical manufacturers engaged in the development of novel therapeutic agents and advanced steroid chemistry.

Application

• Pharmaceutical Intermediate: Serves as a key building block in the multi-step synthesis of advanced steroid-based active pharmaceutical ingredients (APIs).
• Research & Development: Used in academic and industrial research settings for studying steroid metabolism, receptor interactions, and structure-activity relationships (SAR).
• Fine Chemical Synthesis: Employed in custom synthesis and contract manufacturing for producing specialized steroid derivatives and reference standards.
• Hormone Analog Development: Acts as a precursor in the development of novel hormonal analogs and modulators for therapeutic applications.

Basic Information

Product Name	17α-Ethynyl-18-Methylestra-3,5-Diene-3,17β-Diol Diacetate
CAS No.	13635-15-9
Molecular Formula	C₂₅H₃₂O₄
Molecular Weight	396.52 g/mol
Synonyms	18-Methyl-17α-ethynylestra-3,5-diene-3,17β-diol diacetate; 17α-Ethynyl-18-methylestra-3,5-diene-3,17β-diol diacetate; 3,17β-Diacetoxy-17α-ethynyl-18-methylestra-3,5-diene; 17α-Ethynyl-18-methyl-3,5-estradiene-3,17β-diol diacetate
EINECS	Contact for details

Quality Control

Our 17α-Ethynyl-18-Methylestra-3,5-Diene-3,17β-Diol Diacetate is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation via spectroscopic methods (IR, NMR), to ensure it meets the stringent requirements for pharmaceutical intermediates. A Certificate of Analysis (COA) detailing all test results is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at controlled room temperature (15-25°C). Keep the container tightly sealed to protect from moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Identification (HPLC)	Retention time matches reference standard
Assay (HPLC)	≥ 98.0%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.