A mobile node moves from a first IP network to a second IP network in a network system in which the first IP network capable of executing communication in accordance with both first and second kinds of IPs and the second IP network capable of executing communication in accordance with only the first kind of IP are connected with each other. The method in question makes it possible to obtain -N-tert-butyl-1,2,3,4-tetrahydroiso-quinoline-3-carboxamide with high yields and purity without using toxic and hazardous reagents. An apparatus comprises a body structure having formed therein a central channel and multiple focusing channels in fluid communication with the central channel through multiple junctions.