A HETEROCYCLIC COMPOUND OR A SALT THEREOF REPRESENTED BY THE FORMULA (1): WHERE R2 REPRESENTS A HYDROGEN ATOM OR A LOWER ALKYL GROUP; A REPRESENTS A LOWER ALKYLENE GROUP OR LOWER ALKENYLENE GROUP; AND R1 REPRESENTS AN AROMATIC GROUP OR A HETEROCYCLIC GROUP. THE COMPOUND OF THE PRESENT INVENTION HAS A WIDE TREATMENT SPECTRUM FOR MENTAL DISORDERS INCLUDING CENTRAL NERVOUS SYSTEM DISORDERS, NO SIDE EFFECTS AND HIGH SAFETY.
