diff --git a/abbreviations.smi b/abbreviations.smi
index 720cb11..3ac25f9 100644
--- a/abbreviations.smi
+++ b/abbreviations.smi
@@ -257,3 +257,4 @@ SEt	CCS[*]
 SnBu3	[*][Sn](CCCC)(CCCC)CCCC
 TMSE	C[Si](C)(C)CC[*]
 n-Hexyl	CCCCCC[*]
+N N