RPP-(Gly-113C2,15N)-FSPFR TFA is 13C- and 15N-labeled Bradykinin (HY-P0206). Bradykinin is an effective endothelium-dependent vasodilator that can lower blood pressure. Bradykinin can induce contraction of bronchial and intestinal non-vascular smooth muscle, increase vascular permeability, and participate in the mechanism of pain[1][2][3][4][5].