Karboksil
O
C
OH
H HCC
OH
Asam Asetat
O
H
Protein,Lipid
Amino
H
N
H
OH
H HO C C N
H
CH3
Alanin
Protein, Asam nukleat
Sulfhidril
SH
COOH
H C CH2 S H
NH2
Sistein
Protein
Fosfat
O OPO O
O HCCCOPO
OH OH H
HHH
Gliserol fosfat
O
Asam nukleat
Metil
H CH H
OH
HO C C NH2
HCH
Alanin
H
Protein
57