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A homodimer of 2.1 Å resolution structure of the complex obtained by aerated overnight conjugation of [(Z6-benzene)Ru(1-{5-[bis(pyridin-2-yl)]pentyl}pyrrole-2,5-dione)Cl]Cl with papain. The protein is presented in a cyan ribbon and the ligand is in a pink stick model for C, and blue for N.
