Disclosed is a novel compound, and pharmaceutically acceptable salts thereof, useful in the treatment or prevention of diseases caused by inhibitory activity on glycine intake, such as schizophrenia, Alzheimer's disease, cognitive impairment, dementia, anxiety disorders (generalized anxiety disorder, panic disorder, obsessive-compulsive disorder, social anxiety disorder, post traumatic stress disorder, specific phobias, acute stress disorder etc.), depression, substance abuse, convulsions, tremors, pain, or sleep disorders. Disclosed are the compound represented by formula [I], and pharmaceutically acceptable salts thereof.本發明係關於提供一種對於以甘胺酸吸收阻礙作用為準的精神分裂症、阿茲海默病、認知功能障礙、失智症、焦慮障礙(全般性焦慮障礙、恐慌障礙、強迫性障礙、社會焦慮障礙、創傷後壓力心理障礙、特定恐懼症、急性壓力障礙等)、憂鬱症、藥物依存、痙攣、手震、疼痛或睡眠障礙等疾病的預防或治療有用之新穎化合物或其醫藥上可被許可的鹽為目的。式[I]所示化合物或其醫藥上可被許可的鹽。
