| http://www.w3.org/ns/prov#value | - Such compounds include those of the following general formula wherein C is carbon, N is nitrogen, l, m, o, p and q are independently 0 or 1; n is an integer from 0 to 3; W is hydrogen or an anionic group at physiological pH; Y is an anionic group at physiological pH; R1 and R2 are independently hydrogen, alkyl, an anionic group at physiological pH, or R1 and R2, taken together with the nitrogen to
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