| http://www.w3.org/ns/prov#value | - e R5 or R6 groups, they may be the same or different, Y??? represents a hydrolyzable group other than a hydroxyl group, a represents 0, 1, 2 or 3, b represents 0, 1 or 2 and m is an integer of 0 to 19 provided that the relation a+mb???1 should be satisfied.
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