Corrigendum to "Three novel Cu(II), Cd(II) and Cr(III) complexes of 6–Methylpyridine–2–carboxylic acid with thiocyanate: Synthesis, crystal structures, DFT calculations, molecular docking and a-Glucosidase inhibition studies" [Tetrahedron 74 (2018) 7198–7208]. (13th August 2021)