| http://www.w3.org/ns/prov#value | - R3 and R4 are H, (CHo)p X2, (CHo)p CHX2 CH2 X2, NH(CHo)p CHX2 CH2 X2, NHCO(CHo)p CH2 X2 or NHCO(CHo)p CHX2 CH2 X2 where o=1 or 2, p is an integer from 0 to 4 and X2 is H, guanidino, OH, NH2, SH, NO2, CF3, CO2 H, SO3 H or PO3 H2 , R5 =H, OH, NH2, (CHk)1 X3, CO(CHk)1 X3, SO(CHk)1 X3 or SO2 (CHk)1 X3 where k=1 or 2, 1 is an integer from 0 to 4 and X3 is guanidino, OH, NH2, SH, NO2, CF3, CO2 H, SO3 H
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