6,7-Dichloromelatonin and related compounds are ovulation inhibitors of the formula ##STR1## wherein R and R.sup.1 are individually F or Cl, R.sup.2 is C.sub.1-3 alkyl, including methyl, ethyl, n-propyl and isopropyl, and R.sup.3 is H or methyl.
6,7-二
氯褪黑素及相关化合物是具有以下结构的排卵
抑制剂:其中R和R.sup.1分别为F或Cl,R.sup.2为C.sub.1-3烷基,包括甲基、乙基、正丙基和异丙基,R.sup.3为H或甲基。