1 C C_COOH
2 C C_CONH
3 C BC1
4 C BC2
5 C BC3
6 C BC4
7 C BC5
8 O O_CONH
9 H BH1
10 H BH2
11 H BH3
12 N N_NH
13 N N_CONH
14 H H_CONH
15 O O_COOH
16 H H_COOH