}
private QueryAtomContainer makeQAC(String smiles) throws Exception {
IMolecule mol = sp.parseSmiles(smiles);
ha.addExplicitHydrogensToSatisfyValency(mol);
QueryAtomContainer qac = QueryAtomContainerCreator.createBasicQueryContainer(mol);
for(int i=0;i<qac.getAtomCount();i++) {
IAtom a = qac.getAtom(i);
if(a.getSymbol().equals("R")) {
a.setSymbol("C");
a.setAtomicNumber(6);
}
}