The present invention provides a compound represented by Formula: ##STR1##

wherein ring A and ring B may be same or different and each is an optionally substituted homocyclic or heterocyclic ring and the like, each R¹ may be same or different and is a hydrogen atom, an optionally substituted hydrocarbon group, an acyl group, an optionally substituted heterocyclic group or SR², etc., X¹ is a bond, an optionally substituted divalent C_1-3 aliphatic hydrocarbon group or —NR³—, etc, X² is a bond, an optionally substituted divalent C_1-3 aliphatic hydrocarbon group, —NR⁴—, —O— or —S(O)_p— (wherein p is 0, 1 or 2), each Y may be same or different and is a hydrogen atom, an optionally substituted hydrocarbon group, a halogen atom, a carboxyl group, an acyl group, an optionally substituted hydroxy group, an optionally substituted amino group, SR⁵, an oxo group, a thioxo group, an optionally substituted imino group, a nitro group, a cyano group, etc., each m may be same or different and is 0 or 1, n is an integer of 1 to 3, q₁ is an integer of 1 to 2n+4, q₂ is an integer of 0 to 2n+3, and the sum of q₁ and q₂ is 2n+4 or a salt thereof.