| http://www.w3.org/ns/prov#value | - The groups R, R1, R2 and R3 may be substituted with one or more substituents including hydroxy, amino, oxo, lower C1 -C6 alkyl, C1 -C6 cycloalkyl, lower C1 -C6 alkylamino, C1 -C6 alkoxy, nitro, azido, cyano, isocyanato, amido, carbamido, sulfonate, or halogen, e.g. fluorine, chlorine, bromine or iodine.
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