Table 2.

Docking results of CS-APC, CS-APCR and CS on SARS-CoV-2 main protease (PDB ID: 6LU7)

Comp. No.	Moieties from the compound	Amino acid residues	Type of interaction Distance Å	Score Kcal/mol
CS-APC	OH	Phe140	H-don, 1.71	− 30.82
	OH	Glu166	H-don 1.30
	OH	Asn142	H-don 26.9% 1.96
CS-APCR	OH	Phe140	H-don, 1.87 and 1.87	− 30.21
	OH and NH	Glu166	H-don, 1.25, 1.25, 2.80, 2.80 and H-acc, 2.62 and 2.62
	CO of pyrazole ring	Gly143	H-acc, 2.67 and 2.67
	OH	His163	H-acc 2.75 and 2.75
	OH	Phe140	H-don, 1.87 and 1.87
CS	OH	Asn142	H-don, 1.45	− 20.79
	OH, NH	Glu166	H-don, 1.25, 1.51, 3.11 and H-acc, 2.80
	OH	Pro168	H-don, 1.71