diff --git a/catalog-v001.xml b/catalog-v001.xml
index 6c32541..fc451bf 100644
--- a/catalog-v001.xml
+++ b/catalog-v001.xml
@@ -2,6 +2,6 @@
 <catalog prefer="public" xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
     <uri id="Imports Wizard Entry" name="http://emmo.info/emmo/1.0.0-beta5" uri="https://raw.githubusercontent.com/emmo-repo/EMMO/1.0.0-beta5/emmo.ttl"/>
     <group id="Folder Repository, directory=, recursive=true, Auto-Update=false, version=2" prefer="public" xml:base="">
-        <uri name="https://w3id.org/emmo/domain/chemicalsubstance/0.2.0/chemicalsubstance" uri="./chemicalsubstance.ttl"/>
+        <uri name="https://w3id.org/emmo/domain/chemicalsubstance/0.3.0-beta/chemicalsubstance" uri="./chemicalsubstance.ttl"/>
     </group>
 </catalog>
diff --git a/chemicalsubstance.ttl b/chemicalsubstance.ttl
index 2a6bb30..2c03183 100644
--- a/chemicalsubstance.ttl
+++ b/chemicalsubstance.ttl
@@ -11,14 +11,13 @@
 @base <https://w3id.org/emmo/domain/chemicalsubstance/chemicalsubstance> .
 
 <https://w3id.org/emmo/domain/chemicalsubstance/chemicalsubstance> rdf:type owl:Ontology ;
-                                                        owl:versionIRI <https://w3id.org/emmo/domain/chemicalsubstance/0.2.0/chemicalsubstance> ;
-                                                        owl:imports <http://emmo.info/emmo/1.0.0-beta5/perspectives/physicalistic> ,
-                                                                    <http://emmo.info/emmo/1.0.0-beta5/perspectives/perceptual> ,
-                                                                    <http://emmo.info/emmo/1.0.0-beta5/disciplines/chemistry> ;
-                                                        dcterms:abstract "This ontology provides terms for chemical substances that can be referenced and re-used other resources."@en ;
-                                                        dcterms:contributor "Jesper Friis" ;
-                                                        dcterms:creator "Simon Clark" ;
-                                                        owl:versionInfo "0.2.0" .
+
+                                                                    owl:versionIRI <https://w3id.org/emmo/domain/chemicalsubstance/0.3.0-beta/chemicalsubstance> ;
+                                                                    owl:imports <http://emmo.info/emmo/1.0.0-beta5> ;
+                                                                    dcterms:abstract "This ontology provides terms for chemical substances that can be referenced and re-used other resources."@en ;
+                                                                    dcterms:contributor "Jesper Friis" ;
+                                                                    dcterms:creator "Simon Clark" ;
+                                                                    owl:versionInfo "0.3.0-beta" .
 
 #################################################################
 #    Annotation properties
@@ -7644,6 +7643,17 @@ dcterms:source rdf:type owl:AnnotationProperty .
                                                 skos:prefLabel "Lead"@en .
 
 
+###  https://w3id.org/emmo/domain/electrochemistry#electrochemistry_a7b05629_80d7_402b_be1a_69933d24c4cb
+<https://w3id.org/emmo/domain/electrochemistry#electrochemistry_a7b05629_80d7_402b_be1a_69933d24c4cb> rdf:type owl:Class ;
+                                                                                                      rdfs:subClassOf :substance_de038959_9251_48d1_a141_3684f14d957f ;
+                                                                                                      emmo:EMMO_26bf1bef_d192_4da6_b0eb_d2209698fb54 "https://www.wikidata.org/wiki/Q283" ;
+                                                                                                      emmo:EMMO_371f5265_fa29_4081_b722_2c530b1fdddb "https://pubchem.ncbi.nlm.nih.gov/compound/Water#section=Related-CAS"@en ;
+                                                                                                      emmo:EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "chemical compound with raw molecular formula H2O"@en ;
+                                                                                                      emmo:EMMO_c84c6752_6d64_48cc_9500_e54a3c34898d "https://en.wikipedia.org/wiki/Water"@en ;
+                                                                                                      skos:altLabel "H2O" ;
+                                                                                                      skos:prefLabel "Water"@en .
+
+
 #################################################################
 #    Annotations
 #################################################################