A compound of the formula (I) or a pharmaceutically acceptable salt thereof:
[wherein
X1 and X2 each is independently lower alkylene;
X3 is ═CH2, ═CHF or ═CF2;
R1 is substituent,
R2 and R3 each is independently H or lower alkyl;
n is 0, 1, 2, 3 or 4.]
having the activity inhibiting DPP-IV activity. They are therefore useful in the treatment of conditions mediated by DPP-IV, such as NIDDM.
                            化合物的公式(I)或其药学上可接受的盐:[其中X1和X2各自独立地为低烷基;X3为═
CH2,═CHF或═
CF2;R1为取代基,R2和R3各自独立地为H或低烷基;n为0、1、2、3或4]具有抑制
DPP-IV活性的活性。因此,它们在治疗由
DPP-IV介导的疾病,如NID
DM方面是有用的。