| http://www.w3.org/ns/prov#value | - oalkylene moiety having 5 to 30 carbon atoms, each Y1 and Y2 independently is a covalent bond, OCO, N???N, CH???N, C???C, CO, O, S, SO2, O(CO)O, OCS, CH2 --O, CH2 --S, ##STR12## Alternatively, M is expressed as a mesogenic group of the general formula -R10 -Z, -R10 -Z1 -R11 -Z, -R10 -Y1 -R11 -Z2 -R13 -, or a steroidal moiety, preferably selected of the group of cholesteryl compounds, wherein each
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