| abstract |
A compound of formula (I) wherein R<1> is H or a substituent; m is 1-3; Ar is an aromatic group which may be substituted; X is a bond or a divalent straight-chain group having 1-6 atoms which may be substituted; Y is -S-, -O-, or -N(R<2>)- (R<2> is H or a substituent group), Z is -N= or -C(R<3>)= (R<3> is H or a hydrocarbon group), ring A is a benzene ring; ring B is a 5- to 7-membered ring which may be substituted, or a salt thereof is useful for eliciting a prostaglandin I2 receptor agonistic effect. |