code: private IAtomContainer removingFlagsAromaticity(IAtomContainer ac) {
          Iterator<IAtom> atoms = ac.atoms().iterator();
          while (atoms.hasNext())
              atoms.next().setFlag(CDKConstants.ISAROMATIC, false);
          Iterator<IBond> bonds = ac.bonds().iterator();
          while (bonds.hasNext())
              bonds.next().setFlag(CDKConstants.ISAROMATIC, false);
          return ac;
      }
docs: remove the aromaticity flags.
  
  @param ac The IAtomContainer to remove flags
  @return   The IAtomContainer with the flags removed