| http://www.w3.org/ns/prov#value | - alkynyl is defined as 2-6C (or 2-4C), it would contain 2-6 or 2-4 C, N, O, or S atoms, since the heteroalkenyl or heteroalkynyl contains at least one carbon atom and at least one heteroatom, e.g. 2-5C and 1N or 2-4C and 2O. Further, heteroalkyl, heteroalkenyl or heteroalkynyl substituents may also contain one or more carbonyl groups.
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