glicocol : H2N- CH2-COOH 1
valina : CH3-CH(CH3)-C*H(NH2)-COOH 2 enantiomeri (v1, v2)
serina : HO-CH2-C*H(NH2)-COOH 2 enantiomeri (s1,s2)
g-v1; g-v2; g-s1; g-s2; v1-g; v1-v2; v1-s1; v1-s2; s1-g; s1-v1; s1-v2 ; s1-s2;
s2-g; s2-v1; s2-v2; s2-s1 16-dipeptide