A compound of the formula (I): ##STR1## wherein W.sub.1 and W.sub.2 each independently is a hydrogen atom or a ##STR2## wherein Y is a n-C.sub.1-6 alkylene group or a n-C.sub.1-6 alkylene group having a C.sub.1-6 alkyl group substituent; and R.sub.1 and R.sub.2 each independently is a hydrogen atom or a C.sub.1-6 alkyl group, and ##STR3## may form a saturated heterocyclic ring selected from the group consisting of morpholino, pyrrolidino, piperidino, homopiperidino and piperazino groups, and the saturated heterocyclic ring except the morpholino group may have at least one C.sub.1-4 alkyl group, hydroxyl group or halogen atom as a substituent;Z.sub.1 is a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a hydroxyl group, an amino group, a C.sub.1-3 alkyl group or a methoxy group;Z.sub.2 is a hydrogen atom or an amino group;when W.sub.1 and W.sub.2 are both hydrogen atoms, Z.sub.1 is a hydroxyl group or an iodine atom and Z.sub.2 is hydrogen atom, or Z.sub.1 and Z.sub.2 are both amino groups;when Z.sub.1 and Z.sub.2 are both hydrogen atoms, the ##STR4## in either W.sub.1 or W.sub.2 is a morpholino group; when Z.sub.1 is a chlorine atom, a hydroxyl group, an iodine atom, a methyl group or a methoxy group, Z.sub.2 is a hydrogen atom;when Z.sub.1 is an amino group, Z.sub.2 is a hydrogen atom or an amino group;when Z.sub.1 is a methyl group, a methoxy group or an amino group, Z.sub.1 is in the 5-position; when Z.sub.1 is an iodine atom, Z.sub.1 is in the 5- or 7-position; and when Z.sub.1 and Z.sub.2 are both amino groups, Z.sub.1 and Z.sub.2 are in the 5- and 7-positions;and the physiologically acceptable acid addition salt thereof.