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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Ethynyl, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Ethynyl impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Ethynyl-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Ethynyl Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(4S)-6-Chloro-4-(2-cyclopropylethynyl)-1,4-dihydro-4-(triflu... Stable Isotopes CS-T-101709 Not Available Enquire
17-(Ethynyl-13C2)-3-[(tetrahydro-2H-pyran-2-yl)oxy]-19-norpr... Stable Isotopes CS-T-102385 Not Available Enquire
17α-Ethynylestradiol-16,16-d2 3-Methyl Ether Stable Isotopes CS-C-01053 72-33-3 (Unlabelled) Enquire
17α-Ethynylestradiol-2,4,16,16-d4 3-Methyl Ether Stable Isotopes CS-C-01068 72-33-3 (Unlabelled) Enquire
1-ethynyl-4-fluorobenzene-2,3,5,6-d4 Stable Isotopes CS-O-58665 2378754-22-2 Enquire
1-Pentyl-4-[2-(trimethylsilyl)ethynyl]benzene-d7 Stable Isotopes CS-T-102764 138220-08-3(Unlabelled) Enquire
2-Ethynylbiphenyl-13C6 Stable Isotopes CS-T-101393 Not Available Enquire
2-Methyl-d3 Ethynyl Estradiol Stable Isotopes CS-T-99478 Not Available Enquire
3-Iodo-5-[2-(2-pyridinyl)ethynyl]-benzonitrile-d4 Stable Isotopes CS-T-100150 Not Available Enquire
5-Ethynyl-2’-deoxyuridine-d1 Stable Isotopes CS-T-96572 Not Available Enquire
Ethynyl Estradiol 3-Sulfate Sodium Salt-d4 (Major) Stable Isotopes CS-T-102804 724762-79-2 (Unlabelled) Enquire
Ethynyl Estradiol-d7 Stable Isotopes CS-T-99576 Not Available Enquire
Ethynyl-13C2-trimethylsilane Stable Isotopes CS-T-96715 285138-86-5 Enquire
Ethynylestradiol-16,16-d2 ethynyl-13C2 Stable Isotopes CS-O-52760 57-63-6 (Unlabelled) Enquire
N-(3-Desethynylphenyl)-N-(3-bromophenyl) Erlotinib Hydrochlo... Stable Isotopes CS-T-96817 Not Available Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2'S)-2'-Deoxy-2'-fluoro-5-ethynyluridine Impurity CS-T-51952 95740-26-4 Enquire
(5S,8R,9S,13S,14S,17R)-13-Ethyl-17-ethynyl-17-hydroxy-2,4,5,... Impurity CS-O-59189 ---- Enquire
16-Oxo Ethynyl Estradiol Impurity CS-T-60074 1350468-76-6 Enquire
17-alpha-Ethynyl Estradiol-3-Sulfate Triethylamine Salt Impurity CS-P-09239 24560-70-1 (free acid) Enquire
17alpha-Ethynyl-5beta-estrane-3alpha,17beta-diol 3-sulfate Impurity CS-O-60578 109293-07-4 Enquire
1-Hydroxy-4-methyl-17-ethynyl-3-dehydroxyestradiol Impurity CS-T-78594 1034298-00-4 Enquire
1-Methyl Ethynyl Estradiol Impurity CS-T-58205 15071-66-6 Enquire
2-Methyl Ethynyl Estradiol Impurity CS-T-58208 3240-39-9 Enquire
4-Methyl Ethynyl Estradiol Impurity CS-T-58206 155683-61-7 Enquire
6-Ethynyl-4,4-dimethyl-thiochroman Impurity CS-O-32210 118292-06-1 In Stock
6-ethynylnicotinic acid ethyl ester Impurity CS-O-56577 220882-43-9 In Stock
6-Keto Ethynyl Estradiol Impurity CS-T-57001 38002-18-5 In Stock
6-α-Hydroxy Ethynyl Estradiol Impurity CS-T-56010 27521-34-2 In Stock
9,11-Dehydro Ethynyl Estradiol Impurity CS-O-05547 1231-96-5 In Stock
Deschloroethyl Bendamustine ethynylamide impurity Impurity CS-O-45282 Not Available Enquire
(R)-5-Chloro-α-(cyclopropylethynyl)-2-amino-α-(trifluorometh... Impurity CS-T-50615 927812-33-7 Enquire
13beta-ethyl-11-methyliden-18,19-dinor 3-hydroxy-3-ethynyl-p... Impurity CS-O-33239 Not Available Enquire
4-Ethynyl-phenol Impurity CS-DV-02778 2200-91-1 Enquire
N-(2-ethynylphenyl)-6,7-bis(2-methoxyethoxy)quinazolin-4-ami... Impurity CS-O-37083 Not Available Enquire
N-(3-Desethynylphenyl)-N-(3-(1-chlorovinyl)phenyl) Erlotinib Impurity CS-O-33361 2204518-92-1 Enquire
N-(4-ethynylphenyl)-6,7-bis(2-methoxyethoxy)quinazolin-4-ami... Impurity CS-O-37082 1029721-32-1 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-BOC-3-ETHYNYL-3-METHYLAZETIDINE Intermediate CS-ED-42197 1363381-76-3 Enquire
1-bromo-1-ethynylcyclopropane Intermediate CS-O-49043 2763756-15-4 Enquire


Glucuronide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Ethynyl Estradiol 17-β-D-Glucuronide Glucuronide CS-T-54227 75803-39-3 Enquire
Ethynylestradiol-β-D-Glucuronide Glucuronide CS-T-54226 60134-76-1 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(4-((3,5-dimethoxyphenyl)ethynyl)phenyl)methanol Fine Chemicals CS-O-38061 2517266-73-6 Enquire
2-((4-((3-ethynylphenyl)amino)-6-(2-methoxyethoxy)quinazolin... Fine Chemicals CS-O-34203 183320-24-3 Enquire
2-Ethynylpyridine Fine Chemicals CS-M-57120 1945-84-2 Enquire
3-ETHYNYL-2-METHYL-PYRIDINE Fine Chemicals CS-ZB-12301 30413-55-9 Enquire
4-((3,5-dimethoxyphenyl)ethynyl)benzoic acid Fine Chemicals CS-O-38060 2244096-11-3 Enquire
4-((3,5-dimethoxyphenyl)ethynyl)benzonitrile Fine Chemicals CS-O-38059 2244096-10-2 Enquire
ethyl 4-((3,5-dimethoxyphenyl)ethynyl)benzoate Fine Chemicals CS-O-38058 685570-37-0 Enquire
isopropyl 3-(chloroethynyl)-2,2-dimethylcyclopropane-1-carbo... Fine Chemicals CS-O-34812 Not Available Enquire
tert-Butyl (1-ethynylcyclopropyl)carbamate Fine Chemicals CS-MM-67102 1268810-09-8 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-Ethynyltoluene Building Blocks CS-ED-02197 766-97-2 Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Ethynyl-2-d-benzene Stable Isotope Reagent CS-T-103669 3240-11-7 Enquire


Steroids

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
delta-8(9)-Ethynylestradiol Steroids CS-O-43430 100019-04-3 Enquire