Reference standards play a crucial role in the evaluation and diagnosis of Erectile Dysfunction (ED). In the field of medicine, reference standards provide a benchmark against which a patient's condition can be compared, aiding healthcare professionals in accurately diagnosing and treating ED. These standards encompass various parameters such as sexual function questionnaires, laboratory tests, and imaging techniques, which help assess the severity and underlying causes of ED. By utilizing reference standards, healthcare providers can ensure standardized and objective evaluation of patients with ED, leading to improved accuracy in diagnosis, personalized treatment plans, and better outcomes for individuals seeking help for this condition.

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Acetaminotadalafil CS-T-46880 API Standards
Acetildenafil CS-T-46988 API Standards
Acetildenafil D8 CS-T-46989 Stable Isotopes
Amino Tadalafil CS-T-48087 Impurities
Avanafil CS-O-05671 API Standards
Avanafil 13C5 15N CS-O-15725 Stable Isotopes
Avanafil 13C5 15N D2 CS-O-10051 Stable Isotopes
Avanafil D4 CS-B-00233 Stable Isotopes
Avanafil Impurity 13 CS-P-07147 Impurities
Avanafil Impurity 17 CS-P-07148 Impurities

Avanafil Metabolite M16 CS-O-11892 Metabolites
Avanafil Metabolite M4 CS-O-10992 Metabolites
Benzyl Sildenafil CS-P-00354 Impurities
De(methypiperazinyl) Sildenafi... CS-T-51868 Impurities
Demethylpiperazinyl 7-Desoxo 7... CS-T-15198 Impurities
Demethylpiperazinyl Desethyl S... CS-T-15207 Impurities
Descarbonsildenafil CS-T-15923 Impurities
Desethyl Carbodenafil CS-P-07008 Impurities
Desethyl Sildenafil CS-O-10905 Metabolites
Desethyl Sildenafil D3 CS-T-52145 Stable Isotopes
Desmethyl Fondenafil CS-T-88367 Impurities
Homo sildenafil-d5 (ethyl-d5) CS-P-04792 Stable Isotopes
Hydroxy Acetildenafil CS-T-26513 Impurities
Hydroxy Chlorodenafil CS-T-26679 Impurities
Hydroxy Vardenafil CS-O-10340 Metabolites
Hydroxythio Acetildenafil CS-T-28816 Impurities
Lodenafil Carbonate CS-T-57285 API Standards
N-Desethyl Acetildenafil CS-T-51907 Intermediates
N-Desethyl Vardenafil CS-O-10341 Metabolites
N-Desmethyl sildenafil CS-O-05840 Metabolites
N-desmethyl Sildenafil D8 CS-O-06962 Stable Isotopes
N-Desmethyl Tadalafil CS-O-08230 Impurities
N-Octyl Nortadalafil CS-T-59875 Intermediates
Nor Acetildenafil CS-T-59689 Intermediates
Nor Acetildenafil D8 CS-T-59690 Stable Isotopes
Norneo Vardenafil CS-T-37594 Impurities
Piperazonifil CS-T-40080 API Standards
Piperiacetildenafil CS-T-40099 API Standards
Propoxyphenyl Sildenafil CS-P-00252 Impurities
Propoxyphenyl Thioaildenafil CS-T-40729 Impurities
Propoxyphenyl Thiosildenafil CS-T-40727 Impurities
Propoxyphenyl-thiohydroxyhomos... CS-T-40726 Impurities
Pseudo Vardenafil CS-T-40928 Impurities
S-Desethylpiperidino S-(Glycin... CS-T-88835 Impurities
S-Desethylpiperidino S-[2-Carb... CS-T-88320 Impurities
Sildenafil CS-O-31711 API Standards
Sildenafil Chlorosulfone CS-O-08159 Impurities
Sildenafil citrate CS-O-30760 API Standards
Sildenafil Citrate Impurity 2 CS-O-14093 Impurities
Sildenafil Citrate Impurity 3 CS-O-14094 Impurities
Sildenafil Citrate Impurity-1 CS-O-08158 Impurities
Sildenafil D3 CS-O-06964 Stable Isotopes
Sildenafil D8 CS-O-06963 Stable Isotopes
Sildenafil Dimer Impurity CS-DG-00019 Impurities
Sildenafil EP Impurity D CS-O-14710 Impurities
Sildenafil Impurity A CS-O-08160 Impurities
Sildenafil impurity A (Y000157... CS-EG-00647 EP Standards
Sildenafil Related Compound CS-P-00253 Impurities
Sildenafil-N-Oxide CS-O-01446 Impurities
Tadalafil CS-O-02425 API Standards
Tadalafil 13C2D3 CS-BU-00076 Stable Isotopes
Tadalafil 13CD3 CS-O-15332 Stable Isotopes
Tadalafil D3 CS-O-02787 Stable Isotopes
Tadalafil Desmethylene Impurit... CS-O-08226 Impurities
Tadalafil EP Impurity A CS-O-08227 Impurities
Tadalafil EP Impurity B CS-O-08228 Impurities
Tadalafil EP Impurity C CS-O-08229 Impurities
Tadalafil EP Impurity D CS-P-08134 Impurities
Tadalafil EP Impurity I CS-AQ-00154 Impurities
Tadalafil Impurity 1 CS-T-35159 Impurities
Tadalafil Impurity 10 CS-P-06952 Impurities
Tadalafil Impurity 6 CS-P-02138 Impurities
Tadalafil Impurity 7 CS-T-48664 Impurities
Tadalafil impurity E CS-AQ-00151 Impurities
Tadalafil impurity F CS-AQ-00152 Impurities
Tadalafil impurity G CS-AQ-00153 Impurities
Thiodimethyl sildenafil CS-O-08164 Metabolites
Thiohomo Sildenafil CS-T-44185 Impurities
Udenafil CS-T-46099 API Standards
Udenafil Impurity 2 CS-P-01737 Impurities
Udenafil Impurity 3 CS-P-01738 Impurities
Udenafil-D7 CS-P-01189 Stable Isotopes
Vardenafil CS-O-30815 API Standards
Vardenafil Acetyl Analogue CS-T-46326 Impurities
Vardenafil Acetyl-d5 Analogue CS-T-62702 Stable Isotopes
Vardenafil D5 Hydrochloride CS-O-07053 Stable Isotopes
Vardenafil Dihydrochloride Sal... CS-T-46324 API Standards
Vardenafil Dimer CS-P-00296 Impurities
Vardenafil Hydrochloride Trihy... CS-O-11329 API Standards
Vardenafil Hydroxy Impurity CS-P-06761 Impurities
Vardenafil N-Oxide CS-T-93343 Impurities
Vardenafil Oxopiperazine (Impu... CS-T-46328 Impurities
Vardenafil-d4 CS-O-10240 Stable Isotopes
Yonkenafil CS-P-02373 API Standards
Yonkenafil-d8 CS-P-02368 Stable Isotopes
"Des-N-Ethyl 3,5-Dimethylaceti... CS-T-15567 Impurities
(1R,3R)-9H-pyrido[3,4-B]indole... CS-O-20035 Intermediates
(1S,3S)-1-(1,3-Benzodioxol-5-y... CS-T-48663 Impurities
1-Methyl-4-nitro-3-propyl-1H-p... CS-T-34288 Intermediates
1-Methyl-4-nitro-3-propylpyraz... CS-T-34289 Impurities
2-(2-Ethoxyphenyl)-5-methyl-7-... CS-O-10916 Intermediates
2-Ethoxybenzoyl chloride CS-O-08156 Impurities
2-Ethoxy-N-Hydroxy Benzamidine CS-P-00103 Impurities
2-Hydroxypropyl Nortadalafil CS-T-56421 Impurities
2'-Oxo Tadalafil CS-O-05922 Metabolites
2-Pyrimidinemethanamine hydroc... CS-O-32415 Intermediates
3-(6,7-Dihydro-1-methyl-3-prop... CS-T-53103 Impurities
4-Amino-1-methyl-3-propyl-1H-p... CS-T-03054 Impurities
4-Ethoxy-3-(5-methyl-4-oxo-7-p... CS-T-22386 Intermediates
5-(2-Ethoxyphenyl)-1,6-dihydro... CS-T-22410 Impurities
5-(2-Ethoxyphenyl)-1-methyl-3-... CS-T-54350 Intermediates
5-Pyrimidinecarboxylic acid,4-... CS-O-32414 Impurities
5-tert-Butyl N-Carbobenzoxy-L-... CS-O-11161 Building Blocks
7-Despropyl 7-Phenyl Vardenafi... CS-T-88237 Impurities