| 摘要 |
Liquid-crystalline compounds of the formula I in which R<1>, A<1>, A<2>, Z<1>, Z<2>, X, a, b, L<1>, L<2 >and L<3 >are as defined herein, 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.
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