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Pfizer partnership: In June 2014, Circle entered into collaborations to develop permeable macrocyclic peptides against two Pfizer-nominated targets. Under the terms of each of the two collaboration agreements, Pfizer has the exclusive option to take exclusive rights to compounds identified in the collaborations.


Circle is open to additional partnering collaborations with pharmaceutical and biotechnology companies who share our excitement in the potential of macrocyclic peptides. Please contact us at