| Catalogue number: | PA 05 46110 | 
| Chemical name: | 4-Methyl-ethinylestradiol | 
| CAS Number: | 155683-61-7 | 
| Category: | impurities,pharmaceutical standards,intermediates,Fine Chemicals,steroids | 
| Synonyms: | 4-Methyl Ethynyl Estradiol; (17α)-4-Methyl-19-norpregna-1,3,5(10)-trien-20-yne-3,17-diol;Ethinyl Estradiol Impurity K (EP); | 
| Molecular form: | C21H26O2 | 
| Appearance: | White Powder | 
| Mol. Weight: | 310.43 | 
| Storage: | 2-8°C Refrigerator | 
| Shipping Conditions: | Ambient | 
| Applications: | NA | 
Ethinylestradiol - Impurity K
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		![(17S)-17-Ethynyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a] NA](https://www.pharmaffiliates.com/pimages/PAI05005205.jpg) 
		 
		![[2,2'-Bi-19-norpregna-1,3,5(10)-trien-20-yne]-3,3',17,17'-tetrol, (17a 303014-88-2](https://www.pharmaffiliates.com/pimages/PA050461009.jpg) 
		 
		 
		 
 
 
