6TXG:
reference: High-resolution crystal structures of a "half sandwich"-type Ru(II) coordination compound bound to hen egg-white lysozyme and proteinase K., Chiniadis L, Bratsos I, Bethanis K, Karpusas M, Giastas P, Papakyriakou A, J Biol Inorg Chem. 2020 Apr 8. pii: 10.1007/s00775-020-01786-z. doi:, 10.1007/s00775-020-01786-z. PMID: 32266561

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