| abstract |
(57) [Summary] [Problem] To provide a preventive / therapeutic agent for depression, anxiety, manic depression or mental illness. SOLUTION: The formula: A heterocyclic ring having -CS-N <; R a and R b are bonded together to form a ring A, or the same or different, and a substituent on a hydrogen atom or an M ring; A homocyclic or heterocyclic ring optionally having a group, at least one of which is a heterocyclic ring optionally having a substituent; C A ring is a homo- or heterocyclic ring which may have a substituent; a Z-ring is a nitrogen-containing heterocyclic ring which may be substituted; and n represents an integer of 1 to 6] or a salt thereof. A prophylactic / therapeutic agent for depression, anxiety, manic depression or mental illness, comprising: |