diff --git a/STOUT/repack/helper.py b/STOUT/repack/helper.py
index ca1c7dd..3468a87 100644
--- a/STOUT/repack/helper.py
+++ b/STOUT/repack/helper.py
@@ -1,8 +1,5 @@
-import os
 import tensorflow as tf
-import tensorflow.keras as keras
 import re
-import unicodedata
 import numpy as np
 import pystow
 from typing import List, Tuple, Dict
@@ -103,6 +100,7 @@ def split_iupac(IUPACName: str) -> str:
         tokenized_IUPACname = " ".join(map(str, splitted_list))
         return tokenized_IUPACname
     except Exception as e:
+        print(e)
         print(IUPACName)
 
 
diff --git a/STOUT/stout.py b/STOUT/stout.py
index 9e9023e..a3872fc 100644
--- a/STOUT/stout.py
+++ b/STOUT/stout.py
@@ -4,7 +4,6 @@
 import os
 import pickle
 import pystow
-import re
 import logging
 from .repack import helper
 
diff --git a/requirements.txt b/requirements.txt
index 6150eee..7815c38 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ tensorflow-gpu==2.15.0
 pystow
 unicodedata2
 jpype1
+rdkit