HNMPA- (AM) 3 is a cell-permeable and selective insulin receptor tyrosine kinase inhibitor analog of HNMPA. HNMPA- (AM) 3 greatly inhibits the ability of prothoracicotropic hormone (PTTH) to activate ERK phosphorylation and stimulate ecdysteroidogenesis. HNMPA- (AM) 3 is also effective in inhibiting ecdysteroid production (IC50=14.2 μM) and insulin receptor activity (IC50 is 14.2 μM and 200 μM in mosquitoes and mammals, respectively) [1][2].