The present invention relates to a compound of the formula [I]: ##STR00001## wherein G.sup.1 is an alkyl which is substituted by a halogen atom or an alkoxy, or a group of the formula: ##STR00002## wherein ring B is benzene ring which may be substituted, etc., Q.sup.1 and Q.sup.2 maybe the same or different, and each is hydrogen atom, a halogen atom or an alkyl, n is 0, 1, 2, 3 or 4, R.sup.1 is hydrogen atom, an alkyl which may be substituted, a cycloalkyl which may be substituted, a phenyl which may be substituted, etc., Z.sup.1, Z.sup.2, Z.sup.3 and Z.sup.4 may be the same or different, and each is CH or N, provided that 3 or more of Z.sup.1, Z.sup.2, Z.sup.3 and Z.sup.4 should not be N at the same time, G.sup.2 is hydrogen atom, --NR.sup.3R.sup.4, --OR.sup.5, etc., where R.sup.3 to R.sup.8 each is independently hydrogen atom, an alkyl which may be substituted, an alkenyl, an alkynyl, etc., or a pharmaceutically acceptable salt thereof.