Patent ID: 7238720

Claim:
A method of treating diabetic diseases by using a dipeptidyl peptidase IV inhibiting agent represented by the general formula (I): wherein R 1a represents a C 1-6 alkyl group, a C 3-8 cycloalkyl group, a 5 to 10-member aromatic heterocyclic group, a C 6-10 aromatic hydrocarbon-cyclic group, a 4- to 10-member heterocyclic group, or a C 4-13 polycycloalkyl group; n means an integer of 2; W represents a single bond, or a C 1-6 alkylene group; X 1 repesents a nitrogen atom, and X 2 represents a methine group; Z represents a group represented by following formula Z-1: wherein each of R 2a and R 2b independently represents a C 1-6 alkyl group, or a C 2-6 alkenyl group; and wherein R 1a may be substituted with one to three substituents selected from the group consisting of (1) halogen atoms, (2) a hydroxyl group, (3) C 2-6 alkenyl groups, (4) C 2-6 alkynyl groups, (5) a phenyl group, (6) a cyano group, (7) C 1-6 alkoxy groups which may be substituted with one to three halogen atoms or C 1-6 alkoxy groups, and (8) C 1-6 alkyl groups which may be substituted with one to three halogen atoms or C 1-6 alkoxy groups.