Table 2 .

In silico virtual screening studies and proposed drugs

Target	Drug Libraries	Proposed potential drugs	Reference
3CLpro	Phytochemicals with antiviral activity from 11 plants retrieving from literature and PubChem	Quercetin 3-vicianoside, Absinthin, Delphinidin 3-O-glucoside, Chrysoeriol 8-C-glucoside, Piperolactam A	Joshi et al., 2020 [40]
	DrugBank	Proflavine, Chloroxine, Demexiptiline, Fluorouracil, Oteracil	Gao et al., 2020 [41]
	FDA approved drugs from DrugBank, ZINC, Selleckchem, Enamine subsets, e-Drugs and BindingDB	Metyrapone, Rufinamide, Zonisamide, Lacosamide, Apatinibe	Federico et al., 2021 [42]
	FDA approved drugs from ZINC	Tetracycline, Dihydroergotamine, Ergotamine, Dutasteride, Nelfinavir	Gul et al., 2020 [43]
	FDA approved drugs from ChEMBL, DrugBank, DrugCentral, Selleckchem	ENMD-981693, Felypressin, Brilacidin, Ritonavir, Saquinavir	Cavasotto et al., 2021 [44]
	FDA approved drugs from ChEMBL, DrugBank, ZINC, Selleckchem	Talampicillin, Lurasidone	Elmezayen et al., 2020 [45]
	KNApSAcK	Caribine, Cryptopleurine, Justicidin D, Diphyllin, Quercetin	Gani et al., 2021 [46]
	FDA approved drugs from DrugBank and ZINC	Ivermectin, Diosmin, Selinexor, Bromocriptine, Elbasvir, Dihydroergotamine	Yuce et al., 2021 [47]
PLpro	FDA approved drugs from ChEMBL, DrugBank, DrugCentral, Selleckchem	Anatibant, Pilaralisib, Tiracizine, Zabofloxacin, Picotamide	Cavasotto et al., 2021 [44]
RBD of S protein	FDA approved drugs from ChEMBL, DrugBank, DrugCentral, Selleckchem	Pralatrexate, Carumonam, Aclerasteride, Granotapide	Cavasotto et al., 2021 [44]
	KNApSAcK	(–)-beta-sitosterol, 10-Methoxycamptothecin, Inoxanthone, Emetine, Alpha-cedrene	Gani et al., 2021 [46]
Nsp12 (RdRp)	FDA approved drugs from ZINC database	Eltrombopag, Tipranavir, Ergotamine, Conivaptan	Gul et al., 2020 [43]
	FDA approved drugs from e-Drugs3D	Quinupristin, Cetrorelix, Dactinomycin, Rifampin, Sirolimus	Pokhrel et al., 2020 [48]
	ZINC15 database	Ivermectin, Rifabutin, Rifapentine, Fidaxomicin, 7-methyl-guanosine-5'-triphosphate-5'-guanosine	Parvez et al., 2020 [49]
	KNApSAcK	Justicidin D, 10-Methoxycamptothecin, Inoxanthone, 3-O-Caffeoylquinic acid	Gani et al., 2021 [46]
	Phytochemicals from Indian medicinal plants	Cordifolide A, Sitoindoside IX	Koulgi et al., 2021 [50]
Nsp13	Natural compounds from MPD3 database	ZINC257223845	Ahmad S. et al., 2021 [51]
	Natural compounds from IMPPAT database	(+)-Epiexcelsin, Euphorbetin, Isorhoeadine, Picrasidine M, Picrasidine N	Vivek-Ananth et al., 2021 [52]
Nsp14 (N7-MTase)	Compounds from Traditional Chinese Medicine database	TCM20111, TCM31007, TCM3495, TCM5376, TCM57025	Selvaraj et al., 2021 [53]
	FDA approved, worked-out-FDA or investigational-only drugs from ZINC database	Hypericin, Olysio, Sovaprevir, Celsentri, Saquinavir	Liu et al., 2021 [54]
Nsp14 (ExoN)	FDA approved, worked-out-FDA or investigational-only drugs from ZINC database	Hypericin, Bromocriptine, Tanespimycin, Idarubicin, Emend	Liu et al., 2021 [54]
Nsp15	FDA approved drugs from ZINC	Citrate, Dihydroergotamine, Ergotamine, Glisoxepine, Idarubicin	Chandra et al., 2020 [57]
	FDA approved drugs from DrugBank	Elbasvir, Paritaprevir	Sixto-Lopez Y et al., 2021 [58]
	Selleckchem Natural compound library	Oleuropein, Thymopentin	Vijayan R & Gourinath S 2021 [59]
Nsp16	FDA approved drugs from the PyRx 0.8 virtual screening tool	Digitoxin, Dihydroergotamine, Irinotecan, Sinefungin, Teniposide	Sharma K et al., 2020 [55]
	Natural compounds from North African Natural Products database	Citrinamide A, 4,5-Di-p-trans-coumaroylquinic acid, Genkwanin-6-C-beta-glucopyranoside, Paraliane diterpene	Mohammad A et al., 2021 [56]