{
  "(=O)": 29004,
  "(Cl)": 29000,
  "(F)": 28998,
  "([N+]([O-])=O)": 29002,
  "N#C": 29003,
  "[C@@H]": 28997,
  "[C@H]": 28996,
  "c1": 28999,
  "c2": 29001
}