| http://www.w3.org/ns/prov#value | - Preferably, the alkyl group has 1 to 20 carbon atoms (whenever a numerical range; e.g. ???1-20???, is stated herein, it means that the group, in this case the alkyl group, may contain 1 carbon atom, 2 carbon atoms, 3 carbon atoms, etc. up to and including 20 carbon atoms).
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