The technique of the present invention enhances the separation efficiency and the production efficiency of hydrogen in a hydrogen production system for fuel cells, while reducing the size of the whole fuel gas production system. In a preferred embodiment of the invention, the compounds are opioid receptor antagonists. The session file includes an audio file and multimedia data such that the computing device can process the session file to present the multimedia presentation of the audio file to the user. The sum of the numbers of electrode fingers and dummy electrodes that a straight line extending from the end of at least one of electrode fingers in the boundary acoustic wave propagation direction crosses before reaching the side of the first busbar or the side of the second busbar is equal to or greater than 5. The channel preferably is closed at one end, and contains an opening for introduction of a sample.