code: private void cleanFlagReactiveCenter(IAtomContainer ac) {
          for (int j = 0; j < ac.getAtomCount(); j++)
              ac.getAtom(j).setFlag(CDKConstants.REACTIVE_CENTER, false);
          for (int j = 0; j < ac.getBondCount(); j++)
              ac.getBond(j).setFlag(CDKConstants.REACTIVE_CENTER, false);
      }
docs: clean the flags CDKConstants.REACTIVE_CENTER from the molecule.
  
  @param ac