Connection table data structure. 
- Parameters
 - 
  
    | n_atoms | Number of atoms in the molecule.  | 
    | n_bonds | Number of bonds in the molecule.  | 
    | n_atom_lists | Number of atom lists.  | 
    | chiral_flag | Chiral flag indicating the presence of chiral centers.  | 
    | n_stext_entries | Number of stereo text entries.  | 
    | n_reaction_components_plus_1 | Number of reaction components.  | 
    | n_reactants | Number of reactants.  | 
    | n_products | Number of products.  | 
    | n_intermediates | Number of intermediates.  | 
    | n_property_lines | Number of property lines.  | 
    | follow_inchi_1_treating_iso_mass | Flag indicating whether to follow InChI-1 treating isotopic mass.  | 
    | version_string | Version string indicating the format version.  | 
    | atoms | Pointer to the array of atom block data structure.  | 
    | bonds | Pointer to the array of bond block data structure.  | 
    | coords | Pointer to the array of coordinate data structure.  | 
    | sgroups | Growable array of pointers to Sgroup objects.  | 
    | v3000 | Pointer to the V3000 specific data structure.  |