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- W2017485808 abstract "A large number of esters of norethisterone (17 alpha-ethynyl-17 beta-hydroxyestr-4-en-3-one) and levonorgestrel (D-(-)-13 beta-ethyl-17 alpha-ethynyl-17 beta-hydroxygon-4-en-3-one) were synthesized and tested for biological activity. The test employed in these studies was the duration of estrus suppression in cycling mature rats. In the norethisterone series several esters exhibited duration of activity comparable to that of norethisterone enanthate. In the levonorgestrel series the butanoic, cyclobutylcarboxylic and cyclopropylcarboxylic esters were longer acting than medroxyprogesterone acetate (17 alpha-acetoxy-6 alpha-methylpregn-4-ene-3,20-dione) when prepared as aqueous microcrystalline suspensions.A large number of esters of norethisterone (17alpha-ethynyl-17beta-hydroxyestr-4-en-3-one) and levonorgestrel (D-(-)-13beta-ethyl-17alpha-ethynyl-17beta-hydroxygon-4-en-3-one) were synthesized and tested for biological activity. The test employed in these studies was the duration of estrus suppression in cycling in mature rats. In the norethisterone series, several esters exhibited duration of activity comparable to that of norethisterone enanthate. In the levonorgestrel series, the butanoic, cyclobutylcarboxylic, and cyclopropylcarboxylic esters were longer acting than medroxyprogesterone acetate (17alpha-acetoxy-6alpha-methylpregn-4-ene-3,20-dione) when prepared as aqueous microcrystalline suspensions." @default.
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- W2017485808 date "1983-03-01" @default.
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- W2017485808 title "Long-acting contraceptive agents: Structure activity relationships in a series of norethisterone and levonorgestrel esters" @default.
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- W2017485808 doi "https://doi.org/10.1016/0039-128x(83)90111-3" @default.
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