| http://www.w3.org/ns/prov#value | - W is independently selected from hydrogen, halogen, or a substituted or unsubstituted (referring to the following W groups) alkyl (preferably containing 1 to 6 carbon atoms), cycloalkyl (preferably containing 4 to 6 carbon atoms), aryl (preferably containing 6 to 12 carbon atoms, such as phenyl or naphthyl) or a heterocyclic group (preferably containing 1 to 6 carbon atoms and 1 to 4 heteroatoms);
|
