This has led to the selection of 4-guanidinobenzoates with either acetamenophen or ethylparaben as the phenol moiety for clinical evaluation, because they are orders of magnitude more contraceptive than nonoxynol-9 and less irritating to the vagina.
that acts to prevent conception as a result of sexual intercourse
الواصلة
that acts to pre·vent con·cep·tion as a re·sult of sex·u·al in·ter·course