N-formyl Linagliptin is primarily used as a pharmaceutical intermediate and impurity reference standard during the synthesis quality control and analytical testing of the antidiabetic drug Linagliptin.

The purpose of N-formyl Linagliptin is to support pharmaceutical research process development and regulatory compliance by helping identify quantify and control impurities formed during Linagliptin manufacturing.

N-formyl Linagliptin is a formylated derivative of Linagliptin that is typically formed as a synthetic byproduct or degradation-related impurity and is not intended for therapeutic use in patients.