| http://www.w3.org/ns/prov#value | - l, carboxy, C2 -C10 alkoxycarbonyl, phenyl, C7 -C12 aralkyl and ring substituted benzyl wherein said substituent is C1 -C5 alkyl or C1 -C5 alkoxy; R4 is selected from the group consisting of C1 -C10 alkyl, C6 -C10 aryl, C7 -C12 aralkyl and 5-indanyl; and n is an integer of 0, 1 or 2.
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