MDPI is an acronym shared by two related organizations nominally headquartered in Basel (Switzerland) and with larger offices in Beijing and Wuhan (China): Molecular Diversity Preservation International, an organization whose stated aim is to "preserve chemical samples for research," and MDPI AG (Multidisciplinary Digital Publishing Institute), a publisher of peer-reviewed open-access journals.It is considered a predatory open access publishing company publishing journals of dubious quality by Jeffrey Beall.