| http://www.w3.org/ns/prov#value | - As the alkynyl groups represented by R1, R2, R5 and R6, a substituted or unsubstituted alkynyl group having from 2 to 18 carbon atoms is preferred, and a substituted or unsubstituted alkynyl group having from 2 to 8 carbon atoms is more preferred, such as ethynyl and 2-propynyl.
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