| 摘要 |
Novel liquid crystal dyestuffs of the formula <IMAGE> wherein Y and Z are different and can be nitro or cyano and -N(R)2 wherein R is alkyl or alkylene, preferably of 1 to 4 carbon atoms, and X can be hydrogen, methyl, fluoro or chloro, can be added to known liquid crystal compositions to impart color to the mixtures and improve contrast in a liquid crystal electro-optic device containing such mixtures.
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