Polyamine compounds, method of synthesis and method of use for anti-cancer purposes, for enhancing the activity of existing anti-cancer drugs, as well as, for inhibiting N-Methyl-D-Aspartate receptors found in neurotransmission systems are provided. One or more geographical regions are defined, with corresponding telephone parameters defined for each region. The seven forward gear meshes provide at least nine forward gear ratios for the transmission. The constraints of the standard package dimensions and the component assembly method are taken into account. The rocking mechanism includes a first link member provided pivotally, a second link member provided pivotally on the first link member and pivotally connected to the pressure-receiving member, and an actuator configured to cause the first link member and the second link member to pivot.