AUTHOR= Frontiers Editorial Office TITLE=Retraction: Synthesis of efficient cobalt–metal organic framework as reusable nanocatalyst in the synthesis of new 1,4-dihydropyridine derivatives with antioxidant activity JOURNAL=Frontiers in Chemistry VOLUME=11 YEAR=2023 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1285183 DOI=10.3389/fchem.2023.1285183 ISSN=2296-2646