a popped is a mean of inhibitor
knock is bump. slap is bump. inhibitor is substance. pde1_selective_inhibitor is pde_selective_inhibitor. anticatalyst is inhibitor. defenestration is ejection. suffixation is affixation. pde2_inhibitor is pde_selective_inhibitor. pde5_selective_inhibitor is pde_selective_inhibitor. pde4_inhibitor is pde_selective_inhibitor.