| http://www.w3.org/ns/prov#value | - As shown in Formula II, R1 is preferably an alkyl, alkenyl, alkynyl or aralkyl group containing from 0 to 20 heteroatoms; more preferably R1 is methyl and most preferably R1 is sulfoalkyl or an alkyl containing-one or more hydrophilic groups selected from sulfonate, sulfate, ???CO2H, phosphonate, ethylene glycol, polyethylene glycol, quaternary ammonium (???N+R3), or any groups containing one or m
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