| http://www.w3.org/ns/prov#value | - In yet a further embodiment, R1a is optionally substituted alkenyl (e.g., alkenyl is ethenyl or propenyl), which may be substituted with groups such as hydroxy, alkoxycarbonyl (e.g., butoxycarbonyl), and aryl (e.g., phenyl) which may be further substituted with alkoxycarbonyl (e.g., methoxycarbonyl).
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