Bond:

Class representing a single Bond connecting two or three atoms, depending on kind of the bond

Properties:
BondType
- Bond Type of the Bond
Molecule
- Molecule the bond belongs to
Name
- Bond name for text representation
ID
- Serial number of the Bond Type within all BondTypes of the System
Number
- Serial number of the bond within all bonds in the system having the same kind (pairwise or angle-bending)
Atoms
- Pair or Triplet of atoms bonded by the bond
Value
- Distance or angle of the bond