1 H 1.008 ; Hydrogen bound to carbon
3 N 14.0067 ; Trivalent nitrogen
4 N1 14.0067 ; Trivalent nitrogen
5 N2 14.0067 ; Trivalent nitrogen
6 C1 12.011 ; Aliphatic carbon
7 C2 12.011 ; Aliphatic carbon
8 C3 12.011 ; Aliphatic carbon
9 CP 12.011 ; Aliphatic carbon
10 A6 12.011 ; Aromatic carbon
11 A5 12.011 ; Aromatic carbon
12 A7 12.011 ; Aromatic carbon
13 Aprime 12.011 ; Aromatic carbon
14 Abis 12.011 ; Aromatic carbon
15 L5 14.0067 ; Acceptor nitrogen
16 L6 14.0067 ; Acceptor nitrogen
17 P 30.9738 ; Phosphorus
18 OH 15.9994 ; Divalent oxygen
19 O2 15.9994 ; Divalent oxygen
20 OR 15.9994 ; Divalent oxygen
21 S 32.060 ; Sulphur not bound to hydrogen
22 SH 32.060 ; Sulphur with bound hydrogen
23 M1 14.0067 ; Charged nitrogen
24 M2 14.0067 ; Charged nitrogen
25 M3 14.0067 ; Charged nitrogen
26 HN 1.008 ; Polar hydrogen
27 HO 1.008 ; Polar hydrogen
28 HW 1.008 ; Water hydrogen
29 CL 35.453 ; Chloride ion
30 Obis 15.9994 ; Charged oxygen
31 OP 15.9994 ; Charged oxygen
32 R 14.0067 ; Heme nitrogen
33 W 14.0067 ; Heme nitrogen
34 Y 12.011 ; Heme carbon
35 Z 12.011 ; Heme carbon
37 OF 15.9994 ; Heme oxygen
38 OW 15.9994 ; Water oxygen