Y1 receptor antagonist 1 (H 409-22 isomer) is the active isomer of H-409/22, a neuropeptide Y (NPY) Y1 receptor antagonist that dose-dependently antagonizes the vascular response to exogenous and endogenous NPY in pigs. lagodeoxycholic acid (H 409-22 isomer) is the active isomer of H-409/22, an antagonist of neuropeptide Y (NPY) Y1 receptor.

BIBO3304 (diTFA), a selective neuropeptide Y (NPY) Y1 receptor antagonist, demonstrates oral efficacy. It exhibits high affinity for Y1 receptors in both humans and rats, with IC50 values of 0.38 nM and 0.72 nM, respectively. Additionally, BIBO3304 (diTFA) enhances bone-tendon healing via the Wnt/β-catenin signaling pathway [1] [2] [3].