Compounds of the general formula (I) which are metabolically stable and have an antagonistic activity against PGD
2
receptor:
wherein Y is bicyclic ring; R
1
is optionally substituted heteroaryl; R
2
is hydrogen, etc.; R
3
is —CH
2
—CH
2
—CH
2
—CH
2
—CH═CH—COOR
4
, —CH
2
—CH
2
—CH
2
—CH
2
—X
1
—CH
2
—COOR
4
, —CH
2
—CH═CH—CH
2
—X
1
—CH
2
—COOR
4
or —CH
2
—CH
2
—CH
2
—COOR
4
; R
4
is hydrogen, etc.; X
1
is —O—, etc.
具有通式(I)的化合物在代谢上是稳定的,并且具有对
PGD2受体的拮抗活性:其中Y为双环环;R1为可选择的取代杂环基;R2为氢等;R3为-
CH2- - - -CH═CH-COOR4,- - - - -X1- -COOR4,- -CH═CH- -X1- -COOR4或- - - -COOR4;R4为氢等;X1为-O-等。