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. Author manuscript; available in PMC: 2015 Jul 10.
Published in final edited form as: Dalton Trans. 2011 Mar 14;40(23):6087–6103. doi: 10.1039/c0dt01656j

Fig. 1.

Fig. 1

Structures of (a) diethylenetriaminepentaacetic acid (DTPA) and (b) 1,4,7,10-tetraazacyclododecane tetraacetic acid (DOTA); (c) (d) Examples of q = 2 DTPA based complexes (q: number of bound water molecules). The increase in q is made possible by removing one carboxylate arm of the parent DTPA.83,84