{
  "benzene": {
    "smarts": "c1ccccc1",
    "n_ref": 100
  },
  "pyridine": {
    "smarts": "c1ccncc1",
    "n_ref": 100
  },
  "naphthalene": {
    "smarts": "c1ccc2ccccc2c1",
    "n_ref": 21
  },
  "indole": {
    "smarts": "c1ccc2[nH]ccc2c1",
    "n_ref": 36
  },
  "cyclohexane": {
    "smarts": "C1CCCCC1",
    "n_ref": 89
  },
  "cyclopentane": {
    "smarts": "C1CCCC1",
    "n_ref": 33
  }
}