| http://www.w3.org/ns/prov#value | - In complex ring structures, the carbon atoms in the rings other than the those in the hydroxy aromatic ring are optionally substituted with a wide variety of substituents known to those in the art, including NH2, NO2, SH, SO3 H, CO2 H, CN, halogens, thioethers, alkyl, alkoxy groups and other functional groups such as carbamates, ethers, amides, and esters.
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