AUTHOR=Rijo Patrícia , Estévez Francisco , Sitarek Przemysław , Ferreira Maria-José U. TITLE=Editorial: “Natural Products as a Tool to Design New anti-MDR Lead Molecules.” JOURNAL=Frontiers in Pharmacology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2021.694674 DOI=10.3389/fphar.2021.694674 ISSN=1663-9812