Topology AnalysisBack to index page
The topology analysis functions provide characteristic values related to the topological structure of a molecule.
Returns the number of atoms in the molecule having no aromatic bond (excluding hydrogens).
Returns the number of non-aromatic bonds in the molecule (excluding bonds of hydrogen atoms).
Returns the number of bonds in the molecule including hydrogens.
Returns TRUE if a specified atom of the input molecule is a chain atom (non-ring atoms excluding hydrogens, FALSE otherwise.
Returns the number of chain atoms (non-ring atoms excluding hydrogens).
Returns the number of chain bonds (non-ring bonds excluding bonds of hydrogen atoms).
Returns the smallest number of bonds which must be removed such that no circuit remains. Also known as circuit rank.
Returns the number of fragments (disconnected parts) in the input molecule.
Returns the structure of the largest fragment in the cell. The calculation is based on the number of atoms.
Calculates the steric effect index of an atom.
Returns the polar surface area (PSA), which is formed by polar atoms of a molecule. It is a descriptor that shows good correlation with passive molecular transport through membranes, and so allows estimation of transport properties of drugs.