diff --git a/chebai/preprocessing/bin/smiles_token/tokens.txt b/chebai/preprocessing/bin/smiles_token/tokens.txt
index 6f4c338e..282e4d20 100644
--- a/chebai/preprocessing/bin/smiles_token/tokens.txt
+++ b/chebai/preprocessing/bin/smiles_token/tokens.txt
@@ -514,7 +514,6 @@ p
 [63Cu]
 [Ag++]
 [V-4]
-[V--]
 [V-]
 [51V]
 [Ni+4]