Our STM study of cyclosporin A is published in Chem. Commun.

Discriminatory on-surface complexation by the natural peptide CsA: up to two K atoms within its macrocycle, Co to residue 9 and the macrocycle, Fe non-selectively.
Interaction of cyclosporin A molecules with alkali and transition metal atoms on Cu(111)
Y. Guo, L. Jiang, A. P. Seitsonen, B. Zhang, J. Reichert, A. C. Papageorgiou and J. V. Barth

Chem. Commun., 2021, DOI: 10.1039/D1CC00125F