code: public double calculatePiElectronegativity(IAtomContainer ac, IAtom atom) {
  
          return calculatePiElectronegativity(ac, atom, maxI, maxRS);
      }
docs: calculate the electronegativity of orbitals pi.
  
  @param ac                    IAtomContainer
  @param atom                  atom for which effective atom electronegativity should be calculated
  
  @return piElectronegativity