阿加曲班起始物料杂质，

4-methylpiperidine-2-carbonitrile
Chemical Formula: C7H12N2
Molecular Weight: 124.1870
m/z: 124.1000 (100.0%), 125.1034 (7.6%)
Elemental Analysis: C, 67.70; H, 9.74; N, 22.56