Libraries of compounds containing unnatural amino acids or amino acid analogues were prepared from inexpensive substrates using sustainable processes [1,2,3]. The compounds were evaluated for antimicrobial activity against different pathogens.

Author Contributions
D.H. and A.B. supervised the work carried out by D.H., C.S., A.B. and C.C.; J.M.P.d.L. supervised the antimicrobial screenings.
Acknowledgments
This work was supported by the Research Program SAF-2013-48399-R, Plan Estatal de I + D, Ministerio de Economía y Competitividad, Spain, and European Social Funds (FSE). D.H. thanks CSIC (Spanish Research Council) her JAE postdoctoral research contract, and also thanks her current contract financed by Cabildo de Tenerife, Program TF INNOVA 2016-21 (with MEDI & FDCAN Funds). C.S. thanks Gobierno de Canarias for his former research contract, and MINECO for his current Torres Quevedo contract (PTQ-15-07923) with BIOSIGMA SL. C.C. thanks MINECO for her Doctorados Industriales contract (D1406736) with BIOSIGMA SL.
Conflicts of Interest
The authors declare no conflict of interest.
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