diff --git a/cob-to-external.owl b/cob-to-external.owl
index 999f42f..926dd8c 100644
--- a/cob-to-external.owl
+++ b/cob-to-external.owl
@@ -5,8 +5,899 @@
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
- xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
+ xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
+ xmlns:skos="http://www.w3.org/2004/02/skos/core#">
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diff --git a/cob-to-external.tsv b/cob-to-external.tsv
index 8d32d63..f40aa5e 100644
--- a/cob-to-external.tsv
+++ b/cob-to-external.tsv
@@ -8,9 +8,9 @@ COB:0000007 subatomic particle owl:equivalentClass CHEBI:36342 subatomic particl
COB:0000008 proton owl:equivalentClass CHEBI:24636 proton .
COB:0000009 neutron owl:equivalentClass CHEBI:30222 neutron .
COB:0000010 electron owl:equivalentClass CHEBI:10545 electron .
-COB:0000011 atom skos:closeMatch CHEBI:33250 atom .
+COB:0000011 atom owl:equivalentClass 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 owl:equivalentClass 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 .