prov:value
| - Preferably, R5, R6 and R7, identical or different, are a hydrophilic group selected from sulfonate, sulfate, ???CO2H, phosphonate, ethylene glycol, polyethylene glycol, quaternary ammonium (???N+R3), or any groups containing one or more of the above hydrophilic moiety, which serves to increase water solubility of the molecule.
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