The invention relates to liquid-crystalline compounds of the formula Iin whichR1, R2, A1, A2, A3, A4, Z1, Z2, Z3, V, a, b and c have the meanings indicated in claim 1, and to liquid-crystalline media comprising at least one compound of the formula I and to electro-optical displays containing a liquid-crystalline medium of this type. The part plate defines a portion of a chamber for supplying a vapour coating. These value credits may then be converted andor exchanged to loyalty points in a second merchant’s loyalty point system. The coupling element can include a first end attachable via a first pivot to the second end of the support element and a second end attachable via a second pivot to the connecting element. The surrounding adhesive layer is adhesively disposed between the carrier substrate and the housing frame, and each spherical particle is disposed between the carrier substrate and the housing frame and enclosed by the surrounding adhesive layer.