| http://www.w3.org/ns/prov#value | - The expression of a lower alkynyl group means a straight- or branched-chain alkynyl group having 2 to 6 carbon atoms", and the examples including ethynyl, 2-propynyl, 2-butynyl, 3-butynyl, 1-methyl-2-propynyl, 2-pentynyl, 2-hexynyl or the like.
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