API Small Molecule

get_bonded_atom_pairs(group_name, atom_names)	Getting standard intra-group covalent bonded atom pairs for small molecule residues.
get_group_db(group_name)	Getting the internal reference database dictionary for small molecule groups.
is_small_molecule(name)	Check whether a group name corresponds to a small molecule (ligand or cofactor).
small_molecule_is_amino_acid(...)	Checking whether a small molecule residue is categorized as an amino acid.