Angiotensin I (human, acetate salt hydrate, > 90%), ubiquitin (from bovine erythrocytes, > 98%), and substance P (acetate salt hydrate, > 95%) were obtained from Sigma-Aldrich and used as received. Solvents were purchased in MS quality from Sigma-Aldrich. Synthesis, stability and biological data of ASA–buten–PtCl3 are reported elsewhere [20 (link)].
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