diff --git a/cob-examples.owl b/cob-examples.owl
index 4f34d4a..e7c3fb3 100644
--- a/cob-examples.owl
+++ b/cob-examples.owl
@@ -74,6 +74,15 @@
     
 
 
+    <!-- http://purl.obolibrary.org/obo/CHEBI_17748 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_17748">
+        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/CHEBI_33838"/>
+        <rdfs:label xml:lang="en">thymidine</rdfs:label>
+    </owl:Class>
+    
+
+
     <!-- http://purl.obolibrary.org/obo/CHEBI_25805 -->
 
     <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_25805">
@@ -149,6 +158,35 @@
     
 
 
+    <!-- http://purl.obolibrary.org/obo/CHEBI_33838 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_33838">
+        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/COB_0000013"/>
+        <rdfs:label xml:lang="en">nucleoside</rdfs:label>
+    </owl:Class>
+    
+
+
+    <!-- http://purl.obolibrary.org/obo/CHEBI_36358 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_36358">
+        <owl:equivalentClass>
+            <owl:Class>
+                <owl:intersectionOf rdf:parseType="Collection">
+                    <rdf:Description rdf:about="http://purl.obolibrary.org/obo/COB_0000013"/>
+                    <owl:Restriction>
+                        <owl:onProperty rdf:resource="http://purl.obolibrary.org/obo/COB_0000041"/>
+                        <owl:someValuesFrom rdf:resource="http://purl.obolibrary.org/obo/COB_0000004"/>
+                    </owl:Restriction>
+                </owl:intersectionOf>
+            </owl:Class>
+        </owl:equivalentClass>
+        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/COB_0000013"/>
+        <rdfs:label xml:lang="en">polyatomic ion</rdfs:label>
+    </owl:Class>
+    
+
+
     <!-- http://purl.obolibrary.org/obo/CHEBI_36976 -->
 
     <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_36976">
@@ -159,6 +197,15 @@
     
 
 
+    <!-- http://purl.obolibrary.org/obo/CHEBI_53526 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_53526">
+        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/CHEBI_33838"/>
+        <rdfs:label xml:lang="en">tritiated thymidine</rdfs:label>
+    </owl:Class>
+    
+
+
     <!-- http://purl.obolibrary.org/obo/CHEBI_60248 -->
 
     <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_60248">
@@ -230,26 +277,6 @@
     
 
 
-    <!-- http://purl.obolibrary.org/obo/COBEXAMPLES_0000009 -->
-
-    <owl:Class rdf:about="http://purl.obolibrary.org/obo/COBEXAMPLES_0000009">
-        <owl:equivalentClass>
-            <owl:Class>
-                <owl:intersectionOf rdf:parseType="Collection">
-                    <rdf:Description rdf:about="http://purl.obolibrary.org/obo/COB_0000013"/>
-                    <owl:Restriction>
-                        <owl:onProperty rdf:resource="http://purl.obolibrary.org/obo/COB_0000041"/>
-                        <owl:someValuesFrom rdf:resource="http://purl.obolibrary.org/obo/COB_0000004"/>
-                    </owl:Restriction>
-                </owl:intersectionOf>
-            </owl:Class>
-        </owl:equivalentClass>
-        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/COB_0000013"/>
-        <rdfs:label xml:lang="en">polyatomic ion</rdfs:label>
-    </owl:Class>
-    
-
-
     <!-- http://purl.obolibrary.org/obo/COBEXAMPLES_0000010 -->
 
     <owl:Class rdf:about="http://purl.obolibrary.org/obo/COBEXAMPLES_0000010">
diff --git a/cob-to-external.tsv b/cob-to-external.tsv
index 3681371..8d32d63 100644
--- a/cob-to-external.tsv
+++ b/cob-to-external.tsv
@@ -11,6 +11,7 @@ COB:0000010	electron	owl:equivalentClass	CHEBI:10545	electron	.
 COB:0000011	atom	skos:closeMatch	CHEBI:33250	atom	.
 COB:0000012	atomic nucleus	owl:equivalentClass	CHEBI:33252	atomic nucleus	.
 COB:0000013	molecular entity	skos:closeMatch	CHEBI:23367	molecular entity	No exact match in CHEBI
+COB:0000013	molecular entity	skos:closeMatch	CHEBI:25367	molecule	This is electrically neutral in CHEBI but in COB it is generic. We should make it union of molecule and polyatomic ion
 COB:0000015	protein	owl:equivalentClass	CHEBI:16541	protein polypeptide chain	.
 COB:0000015	protein	owl:equivalentClass	PR:000000001	protein	.
 COB:0000017	cell	owl:equivalentClass	CL:0000000	cell	.