Preferred examples of the compound represented by the above-mentioned formula (I) include a compound, wherein alk is methylene, G is a halogen atom such as chlorine atom, etc., X is ???(CH2)q??? (q represents an integer of 0 to 5), R is an optionally substituted amino group; ring B is an optionally substituted 5- to 8-membered ring containing Y, Y is an optionally substituted sulfur atom or