diff --git a/data/pubchem.csv b/data/pubchem.csv
index fa42dae..c914598 100644
--- a/data/pubchem.csv
+++ b/data/pubchem.csv
@@ -1,4 +1,5 @@
 #did,when,nextofkin
+2818,,135398737
 6006,,135403648
 329970432,,
 329970434,,