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Fig. 5. Chemical structure of suramin and two of it analogues, NF062 and NF036. Note that suramin is a chemically symmetrical molecule containing three sulphonate groups on each of the terminal naphthalene rings. NF062 on the other hand carries only one terminal sulphonate group whilst NF036 is a truncated asymmetric molecule; see Jentsch et al. (Jentsch et al., 1987).