diff --git a/chebai/preprocessing/bin/smiles_token/tokens.txt b/chebai/preprocessing/bin/smiles_token/tokens.txt
index 6f4c338e..7aa9337e 100644
--- a/chebai/preprocessing/bin/smiles_token/tokens.txt
+++ b/chebai/preprocessing/bin/smiles_token/tokens.txt
@@ -506,7 +506,6 @@ p
 [Og]
 [Cr++]
 [Mo-5]
-[W-4]
 [Re+]
 [Os+]
 [Ru-3]