This study presents the first structure isolated from Thuiria breitfussi from the underinvestigated class Hydrozoa. The Breitfussins represent novel halogenated modified dipeptides forming a new structural class containing a combination of indole-oxazole-pyrrole. Given the limited quantity isolated, X-ray crystallography was not possible and structure determination using spectroscopic data was unable to propose a single unequivocal structure consistent with all the data. The structure was therefore supported by a combination of AFM, CASE and DFT calculations, none of which were able to propose a unique solution individually. Remarkably, AFM could be used to determine all the connection positions of the cyclic systems as well as those of the substituent groups: MeO, Br, and I - information that is difficult to obtain with other techniques. Moreover, different AFM contrast above halogen atoms and the MeO group indicate chemical sensitivity within individual molecules.
By: K. Hanssen, B. Schuler, A.Williams, T.B. Demissie, E. Hansen, J. Andersen, J. Svenson, K. Blinov, M. Repisky, F. Mohn, G. Meyer, J.-S. Svendsen, K. Ruud, M. Elyashberg, L. Gross, M. Jaspars, and J. Isaksson
Published in: RZ3872 in 2012
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