Corrigendum: Synthesis and Cytotoxic Activity of Novel Indole Derivatives and Their in silico Screening on Spike Glycoprotein of SARS-CoV-2 - Gobinath, Perumal; Packialakshmi, Ponnusamy; Vijayakumar, Kaliappillai; Abdellattif, Magda H.; Shahbaaz, Mohd; Idhayadhulla, Akbar; Surendrakumar, Radhakrishnan (Frontiers in Molecular Biosciences, 2021)