| prov:value
| - 3; or when taken together, Ry forms a carbocyclic ring of 3 to 7 carbon atoms; R is C1-C8 alkyl, C1-C8 substituted alkyl, Ca-C8 alkenyl, C1-C8 substituted alkenyl, C1-C8 alkynyl, C1-C8 substituted alkynyl, C6-C20 aryl, C6-C20 substituted aryl, C2-C20 heterocycle, C2-C20 substituted heterocycle, or a protecting group; and PG is a protecting group selected from an ether-forming group, an ester-formi
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