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Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.
The NBO charge distribution of each metallofullerene before and after Favipiravir drug adsorption: a, b, c, d, e, f, g, h, i, and j represents C19Ti, C19Ti-F, C19Cr, C19Cr-F, C19Fe, C19Fe-F, C19Ni, C19Ni-F, C19Zn, and C19Zn-F.