prov:value
| - The X group of the formula above is oxy, thio, or imino (--NR--, wherein R is hydrogen or substituted or unsubstituted alkyl of 1 to 10 carbon atoms, e.g. methyl, ethyl, propyl, isopropyl, decyl, benzyl, etc., substituted or unsubstituted cyclohexyl, substituted or unsubstituted phenyl or a substituted or unsubstituted heterocyclic group as defined above, e.g. pyridyl, thienyl, etc.).
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