| http://www.w3.org/ns/prov#value | - The liquid crystals used in the electrooptical liquid crystal systems according to the invention preferably contain 1%-100%, in particular 10%-100% and very particularly 20%-100% of compounds of the formula I. In this case, liquid crystal mixtures are preferred which contain 1-20 and in particular 1-15 compounds of the formula I. If the liquid crystal compounds of the formula I are selected from o
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