In general, the invention is directed toward a device for processing digital video data, such as an encoder, a decoder or an encoderdecoder. In response to this, a torque command change section changes a torque command to a second rotating electric machine other than a first rotating electric machine of which the slip frequency is changed such that a torque fluctuation caused by the change of the slip frequency command value is canceled out. A second layer is positioned on the first layer over the beam and includes a second aperture within which the second boss is suspended by the beam. At least one of the sections is a designated section and is not initially associated with a characteristic. The compound of the following formula III, which is a key compound for the production of citalopram, can be easily produced by subjecting the compound of the following formula II to reduction and cyclization.