| http://www.w3.org/ns/prov#value | - The ???lower alkynyl group??? in the definition of Rd and Re; and the ???lower alkynyl group??? of the ???lower alkynyl group which may optionally be substituted with group(s) selected from Substituent group ????? in the definition of Ra, Rb and ???Substituent group ????? can be a straight or branched alkynyl group having from 2 to 6 carbon atoms such as a ethynyl, 2-propynyl, 1-methyl-2-propynyl,
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