Table 1. The relationship between the functional groups used and amino acids.

	Functional group	Abbreviation	Amino acids
Charged (−)	Acetate ion	ACET	ASP, GLU
Charged (+)	Methylguanidinium	MGUA	ARG
Charged (+)	Methylammonium	MAMM	LYS
Polar	Acetamide	ACEM	ASN,GLN
Polar	Methanol	MEOH	SER,THR
Hydrophobic	Methanethiol	MESH	CYS,MET
Aromatic Polar	Phenol	PHEN	TYR
Aromatic Polar	Indole	INDO	TRP
Aromatic Polar	Imidazole	IMIA	HIS
Aromatic Hydrophobic	Benzene	BENZ	PHE
Hydrophobic	Ibutane	IBUT	VAL, ILE, LEU, ALA