prov:value
| - 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-forming group, a silyl-ether forming group, an amide-forming group, an acetal-forming group, a ketal-forming group, a carbonate-fo
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