diff --git a/chemcrow/tools/safety.py b/chemcrow/tools/safety.py
index 3087e00..cd90ec6 100644
--- a/chemcrow/tools/safety.py
+++ b/chemcrow/tools/safety.py
@@ -1,3 +1,5 @@
+import urllib
+from time import sleep
 import requests
 import pandas as pd
 import pkg_resources
@@ -10,7 +12,7 @@
 from langchain.tools import BaseTool
 
 from chemcrow.tools import Query2SMILES
-from chemcrow.utils import is_smiles
+from chemcrow.utils import is_smiles, tanimoto
 from .prompts import safety_summary_prompt, summary_each_data
 from .databases import Query2CAS, Query2SMILES
 
@@ -231,6 +233,7 @@ def _run(self, cas_number):
     async def _arun(self, cas_number):
         raise NotImplementedError("Async not implemented.")
 
+
 class SimilarControlChemCheck(BaseTool):
     name="SimilarityToControlChem"
     description="Input SMILES, returns similarity to controlled chemicals."