| 摘要 |
1434757 Antifertility agents ENVIRONMENTAL SCIENCE CORP 26 April 1973 [1 May 1972 11 April 1973] 19917/73 Headings A5B and ASE The fertility of female mammals, including vermin, is reduced by administering a compound of formula: wherein R<1> is a C1-22 aliphatic hydrocarbon group, phenyl or benzyl, R<2>-R<4> are C1-20 alkyl and A is an anion. The compounds may be complexed with tetracycline or derivatives thereof, e.g. oxytetracycline. Many compounds are specified.
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