diff --git a/src/biocatalyzer/bioreactor.py b/src/biocatalyzer/bioreactor.py
index 396b5ef..c98a0df 100644
--- a/src/biocatalyzer/bioreactor.py
+++ b/src/biocatalyzer/bioreactor.py
@@ -605,9 +605,9 @@ def _react_single(self, smiles: str, smarts: str):
                         with open(self._new_compounds_path, 'a',  newline='', encoding='utf-8') as f:
                             f.write(f"{smiles_id}\t{smiles}\t{smarts_id}\t{smiles_id}_{uuid.uuid4()}\t"
                                     f"{most_similar_product}\t{result}\t{ecs}\n")
-                            if f"{smiles_id}\t{smiles}\t{smarts_id}\t{smiles_id}_{uuid.uuid4()}\t{most_similar_product}\t{result}\t{ecs}\n".split('\t') != 6:
-                                e = f"{smiles_id}\t{smiles}\t{smarts_id}\t{smiles_id}_{uuid.uuid4()}\t{most_similar_product}\t{result}\t{ecs}\n"
-                                raise ValueError(f"Wrong number of columns. Got {len(e.split('\t'))} columns. {e}")
+                            line = f"{smiles_id}\t{smiles}\t{smarts_id}\t{smiles_id}_{uuid.uuid4()}\t{most_similar_product}\t{result}\t{ecs}\n".split('\t')
+                            if len(line) != 7:
+                                raise ValueError(f"Wrong number of columns. Got {line}")
 
 
     def react(self):