prov:value
| - but are not limited to, COOH, COONa, ???P(O)(OH)2, ???P(O)(ONa)2, ???P(O)(OH)(OR18), ???P(O)(ONa)(OR18), ???SO3H, ???SO3Na, ???B(OH)2, ???B(OH)(ONa), or ???B(ONa)2 where R18 is alkyl or perfluoroalkyl, branched or unbranched, of from 1 to 22 carbon atoms, aryl or heteroaryl, such as phenyl or benzyl, polyether, such as a polyethylene glycol or polypropylene glycol.
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