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. 2012 Aug 21;4:18. doi: 10.1186/1758-2946-4-18

Table 1.

The list of atom and bond types used in labeling interfacial graphs

Atom Description
C.3
Carbon sp3
C.2
Carbon sp2
C.1
Carbon sp
C.ar
Carbon aromatic
C.cat
Carbocation
N.3
Nitrogen sp3
N.2
Nitrogen sp2
N.1
Nitrogen sp
N.ar
Nitrogen aromatic
N.am
Nitrogen amide
N.pl3
Nitrogen trigonal planar
N.4
Nitrogen sp3 positively charged
O.3
Oxygen sp3
O.2
Oxygen sp2
O.co2
Oxygen in carboxylates and phosphates
S.3
Sulfur sp3
S.2
Sulfur sp2
S.O
Sulfoxide Sulfur
S.O2
Sulfone Sulfur
P.3
Phosphorous sp3
F
Fluorine
Cl
Chlorine
Br
Bromine
I
Iodine
Li
Lithium
Na
Sodium
Mg
Magnesium
Al
Aluminum
Si
Silicon
K
Potassium
Ca
Calcium
Cr.th
Chromium (tetrahedral)
Cr.oh
Chromium (octahedral)
Mn
Manganese
Fe
Iron
Co.oh
Cobalt (octahedral)
Cu
Copper
Se
Selenium
Mo
Molybdenum
Sn
Tin
Zn
Zinc
Bond
Description
1
Single bond
2
Double bond
3
Triple bond
am
Amide
ar
Aromatic
nc Not connected

An option for labeling each atom type with the number of hydrogen atoms is available. This way, an sp3 Oxygen with one hydrogen atom is distinguished from an sp3 Oxygen with no hydrogen atoms; this is useful for hydrogen-bonding interactions.