| http://www.w3.org/ns/prov#value | - r R20 groups are present, they may be the same or different; Y represents a hydroxy group or a hydrolyzable group and when two or more Y groups are present, they may be the same or different; a represents 0, 1, 2 or 3, b represents 0, 1 or 2 and m is an integer of 0 to 19, with the condition that the relation a+mb???1 should be satisfied.
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