Compounds and methods for treating diseases mediated by a P2X3 andor a P2X23 receptor antagonist, the methods comprising administering to a subject in need thereof an effective amount of a compound of formula :wherein D, X, R1, R2, R3, R4, R5, R6, R7 and R8 are as defined herein. The stop element includes a stopping surface for the buffer of the elevator. The metallocene is part of a system that can include a fluorided support and a non-coordinating anion activator. The request may be programmed into a power-requesting device or the power-requesting device may develop the request using information about the device to be charged. HpR5\u2003\u2003General formula . This film is obtained by coextruding the various layers and is then used to cover various substrates, for example by injection-moulding the substrate in the melt onto the multilayer film placed in the bottom of an injection mould, the layer of the film being placed against the wall of the mould.