The invention discloses a novel
crystal form of
oxalate of
dipeptidyl peptidase inhibitor, namely, (s)-1-(2-(2-(3-(3,4-dimethoxyphenyl)-2-oxo-1-imidazolidinyl)ethylamino)acetyl)-2-cyanpyrrolidine
oxalate. In X-
ray powder diffraction of the
crystal form, characteristic peaks occur at 2 theta
diffraction angles of 4.5+ / -0.1, 5.5+ / -0.1, 9.0+ / -0.1, 10.9+ / -0.1, 16.4+ / -0.1, 17.7+ / -0.1, 18.1+ / -0.1, 22.0+ / -0.1, 22.7+ / -0.1, 25.6+ / -0.1, 28.1+ / -0.1, 28.4+ / -0.1 and 32.0+ / -0.1. The
crystal form disclosed by the invention is superior to the original
oxalate in stability, and is more stable for light, heat and
humidity and convenient to store and transport; the cost of the DPP-IV (
dipeptidyl peptidase-IV) inhibitor in transportation and preservation processes is decreased; and the safety of the product is further guaranteed.