| 摘要 |
Liquid-crystalline compounds of the formula I in which R<SUP>1</SUP>, A<SUP>1</SUP>, A<SUP>2</SUP>, Z<SUP>1</SUP>, Z<SUP>2</SUP>, X, a, b, L<SUP>1</SUP>, L<SUP>2 </SUP>and L<SUP>3 </SUP>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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