| abstract |
The present invention provides a compound represented by the formula (I) and a salt thereof n n n n n n n n n n wherein: ring A is a 5-membered aromatic heterocycle optionally having substituent(s); R 1 is a hydrogen atom or a hydrocarbon group optionally having substituent(s); W is an oxygen atom or a sulfur atom; X 1 and X 2 may be the same or different and each is a hydrogen atom, a hydrocarbon group optionally having substituent(s) or a heterocyclic group, or, X 1 and X 2 in combination, optionally, form an oxygen atom, a sulfur atom or ═NR 2 ; ring B is an aromatic ring optionally further having substituent(s); Y is a bond, C 1-6 alkylene C 2-6 alkenylene or C 2-6 alkynylene, optionally having substituent(s); and Z is —SO n R 3 or —COR 4 , which are useful as a pharmaceutical agent having GnRH antagonistic action. |