(17α)-10,17-Dihydroxy-19-norpregn-4-en-20-yn-3-one ; CAS # 1236-00-6 ;

17β-Hydroxy-3-isopropoxy-17α-ethynylestr-3,5-diene ;

17α-Ethynyl-17β-hydroxy-5α-estran-3-one ; CAS # 52-79-9 ;

6α,17β-Dihydroxy-17α-ethynylestr-4-en-3-one ; CAS # 438244-33-8 ;

17β-Hydroxy-17α-ethynylestr-4-en-3,6-dione ; CAS # 67696-78-0 ;

Levonorgestrel EP Impurity U ; 17β-Hydroxy-17α-ethynylestr-4-en-3-one ; CAS # 68-22-4 ;

(17α)-19-Norpregna-3,5-dien-20-yne-3,17-diol 3,17-Diacetate ; CAS # 2205-78-9 ;

Norethindrone 6,7-Dehydro Impurity ; 17β-Hydroxy-17α-ethynylestr-4,6-dien-3-one ; CAS # 31528-46-8 ;

Norethindrone 5,6-Dehydro Impurity ; 17β-Hydroxy-17α-ethynylestr-5-en-3-one ; CAS # 22933-71-7 ;

Norethynodrel ; 17β-Hydroxy-17α-ethynylestr-5(10)-en-3-one ; CAS # 68-23-5 ;

Norethindrone 3-Ethinyl Impurity ; 3-Ethynyl-19-norpregna-3,5-dien-20-yn-17�-ol ; CAS # 79727-03-0 ;

Norethindrone 3-Ethoxy Impurity ; 17β-Hydroxy-3-ethoxy-17α-ethynylestr-3,5-diene ; CAS # 96487-85-3 ;

Norethindrone 17-epi-Impurity ; 17α-Hydroxy-17β-ethynylestr-4-en-3-one ; CAS # 38673-36-8 ;

Norethindrone 6-beta-Hydroxy Impurity ; 6β,17β-Dihydroxy-17α-ethynylestr-4-en-3-one ; CAS # 51724-44-8 ;