In the industry these 'cyclic peptides' are also referred to as 'contrained peptides'.
Below is an endorsement of this area of research by Peptidream(the elephant in the room) at AsiaTides 2015 conference:
Paradigm Shift in Drug Discovery: Constrained Peptides and Peptide-Based Drug Design
Constrained peptides represent highly valuable chemical matter for use in biological validation, identifying hit/lead molecules for drug discovery, and also directly as peptide therapeutics. Our in-house approach to the optimization of constrained peptides, and how these peptides contribute to hit finding for difficult target classes from a general perspective will be introduced.
Keiichi Masuya, Ph.D., Chief Operating Officer, PeptiDream, Inc., Japan
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(20min delay)