| http://www.w3.org/ns/prov#value | - R3 and R4 are each selected from the following: H, (CHo)p X2. (CHo)p CHX2 CH2 X2, NH(CHo)p CHX2 CH2 X2, NHCO(CHo)p CH2 X2, and NHCO(CHo)p CHX2 CH2 X2 where o is either 1 or 2, p is an integer from 0 to 4 and X2 is selected from the group consisting of H, guanidino, OH, NH2, SH, NO2, CF3, CO2 H, SO3 H and PO3 H2.
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