prov:value
| - R12, R13, R14 and R15 can be the same or different and are selected from the group consisting of hydrogen, ???R, substituted or unsubstituted aryl, halides, nitro, sulfonate, sulfate, phosphonate, ???CO2H, ???C(O)OR, cyano (???CN), ???SCN, ???OR, ???SR, ???SSR, ???C(O)R, ???C(O)NHR, ethylene glycol and polyethylene glycol, where R is an alkyl group having 1 to 6 carbon atoms;
|