AN OBJECT OF THE PRESENT INVENTION IS TO PROVIDE A MEDICINAL DRUG MUCH IMPROVED IN ANTI TUMOR ACTIVITY AND EXCELLENT IN SAFETY. ACCORDING TO THE PRESENT INVENTION, THERE IS PROVIDED A MEDICINAL DRUG CONTAINING A COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA (1) OR A SALT THEREOF AS AN ACTIVE INGREDIENT: [FORMULA 1] WHEREIN X1 REPRESENTS A NITROGEN ATOM OR A GROUP -CH=, R1 REPRESENTS A GROUP -Z-R6, IN WHICH Z REPRESENTS A GROUP -CO-, A GROUP -CH(OH)- OR THE LIKE, R6 REPRESENTS A 5- TO 15-MEMBERED MONOCYCLIC, DICYCLIC OR TRICYCLIC SATURATED OR UNSATURATED HETEROCYCLIC GROUP HAVING 1 TO 4 NITROGEN ATOMS, OXYGEN ATOMS OR SULFUR ATOMS, R2 REPRESENTS A HYDROGEN ATOM OR A HALOGEN ATOM, Y REPRESENTS A GROUP -O-, A GROUP -CO-, A GROUP -CH(OH)- OR A LOWER ALKYLENE GROUP, AND A REPRESENTS [FORMULA 2] WHEREIN R3 REPRESENTS A HYDROGEN ATOM, A LOWER ALKOXY GROUP OR THE LIKE, P REPRESENTS 1 OR 2, R4 REPRESENTS AN IMIDAZOLYL LOWER ALKYL GROUP OR THE LIKE.
