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. 2005 May 16;102(21):7459–7464. doi: 10.1073/pnas.0501446102

Fig. 4.

Fig. 4.

Possible metal ion-binding modes in the chelates formed in equilibrium by the M(U–H)+ complexes in aqueous solution (see Conclusions). The negative charge in the uridinate structures is shown on N3, but it can be delocalized in part to the neighboring C(O) groups.