PROBLEM TO BE SOLVED: To provide modulators of the prostacyclin (PGI2) receptor useful for treatment of disorders related to the PGI2 receptor.SOLUTION: Compounds of the present invention and pharmaceutical compositions thereof are directed to methods useful in treatment of: pulmonary arterial hypertension (PAH); idiopathic PAH; familial PAH; PAH associated with a collagen vascular disease, a congenital heart disease, portal hypertension, HIV infection, ingestion of a drug or toxin, hereditary hemorrhagic telangiectasia, splenectomy, pulmonary veno-occlusive disease (PVOD) or pulmonary capillary hemangiomatosis (PCH); PAH with significant venous or capillary involvement; platelet aggregation; coronary artery disease; myocardial infarction; transient ischemic attack; angina; stroke; ischemia-reperfusion injury; restenosis; atrial fibrillation; blood clot formation in an angioplasty or coronary bypass surgery individual or in an individual suffering from atrial fibrillation; atherosclerosis; atherothrombosis; asthma or a symptom thereof; and the like.SELECTED DRAWING: None【課題】プロスタサイクリン(PGI2)受容体に関連する障害の処置に有用なPGI2受容体の調節因子の提供。【解決手段】本発明の化合物およびその薬学的組成物は以下:肺動脈高血圧(PAH);特発性PAH;家族性PAH;膠原血管病、先天性心疾患、門脈圧亢進症、HIV感染、薬物もしくは毒素の摂取、遺伝性出血性毛細管拡張症、脾臓摘出、肺静脈閉塞性疾患(PVOD)、または肺毛細血管腫症(PCH)と関連するPAH;顕著に静脈または毛細血管の関与を伴うPAH;血小板凝集;冠動脈疾患;心筋梗塞;一過性脳虚血発作;狭心症;脳卒中;虚血再灌流傷害;再狭窄;心房細動;血管形成術もしくは冠動脈バイパス形成手術の個体または心房細動に罹患している個体における血塊形成;アテローム性動脈硬化症;アテローム性血栓症;喘息またはその症状などの処置における有用な方法に関する。【選択図】なし