Compounds of formulaas well as pharmaceutically acceptable salts and esters thereof, wherein A and R1 to R4 have the significance given in claim 1 can be used in the form of pharmaceutical compositions. The apparatus also includes a drive coupling to rotate by a driving force generated by the motor, the drive coupling being movable in an axial direction to take an engagement position at which the driving force is transmittable to the driven coupling, and a release position. At least one antenna signal radiating plate is connected to the grounding metal plate by a short-circuit piece and is substantially parallel to and spaced from the grounding metal plate by a distance. The chassis unit is provided with a vertical guide shaft that is inserted into the guide hole when lifting the magazine upper section. A modular filter receives the multi-band frequency division multiplexed signal and separates the frequency bands.