Mixtures of liquid-crystalline compounds comprising at least two different substances of the formula I ##STR1## where Z.sup.1 and Z.sup.2, independently of one another, are polymerizable groups, Y.sup.1 and Y.sup.2, independently of one another, are each a direct bond, --O--, --COO--, --OCO-- or --S--, A.sup.1 and A.sup.2, independently of one another, are spacers, and R.sup.1, R.sup.2 and R.sup.3 are conventional substituents, and novel compounds of the above formula where at least two of Z.sup.1, Z.sup.2, Y.sup.1, Y.sup.2, A.sup.1 and A.sup.2 are not identical, are described. The novel mixtures and compounds are suitable, inter alia, as base material for color-effect materials and piezomaterials, preferably in chirally doped form.