英文别名Levonorgestrel Impurity L (18-Methylester-4-ene-3,17-dione); Gon-4-ene-3,17-dione,13-ethyl-; 18-Methyl-4-Estrene-3,17-Dione; 13-Ethyl-Gona-4-Ene-3,17-Dione; (+)-13-b-Ethylgon-4-ene-3,17-dione; 18-Methyl-19-norandrost-4-ene-3,17-dione; 13-ethyl-gon-4-ene-3,17-dione; 18-methyl-estr-4-ene-3,17-dione; Desogestrel Intermediates; 18-methyl-4-estren-3,17-dione; 18-Methylestr-4-en-3,17-dione; Desogestrel EP Impurity C; 18a-homo-estr-4-en-3,17-dione; D-Ethyl Gonendione 
