| http://www.w3.org/ns/prov#value | - d, at least one of R1, R2, R3, R4, R5 and R6 is an optically active substituent mentioned in Examplification 1, and n is an integer of 1-18, preferably 3-14. ##STR65## wherein R1, R2, R3, R4, R5 and R6 are independently a linear or branched alkyl group having the formula Cn H2n+1 or a substituent group selected from the substituent groups mentioned in Examplification 1, in the case of a discotic l
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