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licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
The hepatitis C NS3 protease inhibitor BILN 2061 21 is based on a 15-membered RCM-derived tripeptide macrocycle (highlighted in red) and showed great promise in phase I clinical trials, but eventually did not make it to the market.