| abstract |
【Task】 Based on orexin (OX) receptor antagonism, sleep disorder, depression, anxiety disorder, panic disorder, schizophrenia, drug addiction, Alzheimer's disease, Parkinson's disease, Huntington's chorea, eating disorder, headache, migraine To provide a therapeutic or prophylactic agent for diseases such as pain, digestive tract diseases, epilepsy, inflammation, immune-related diseases, endocrine-related diseases, and hypertension. [Solution] A medicament comprising, as an active ingredient, a branched alkylheteroaromatic derivative represented by formula (Ia) having an orexin (OX) receptor antagonistic action or a pharmaceutically acceptable salt thereof. [Chemical 1] [Selection figure] None |