Vildagliptin Impurity C Catalogue V670343 CAS 565453-39-6 M.W 321.41 M.F C17H27N3O3 Specifications FAQs (2S)-1-[2-[(3-Hydroxytricyclo[3.3.1.13,7]dec-1-yl)amino]acetyl]-2-pyrrolidine carboxamide