diff --git a/internal-dev/cheminf-ext.owl b/internal-dev/cheminf-ext.owl
index 6f6a4103..bc0c161c 100644
--- a/internal-dev/cheminf-ext.owl
+++ b/internal-dev/cheminf-ext.owl
@@ -90,6 +90,14 @@
         <rdfs:label xml:lang="en">perovskite</rdfs:label>
     </owl:Class>
 
+    <!-- http://purl.enanomapper.net/onto/ENM_8461735 -->
+
+    <owl:Class rdf:about="http://purl.enanomapper.net/onto/ENM_8461735">
+        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/BFO_0000019"/>
+        <rdfs:isDefinedBy>Increased energy price of a reaction due to steric effects (the atomic spacial arrangement in a molecule or ion)</rdfs:isDefinedBy>
+        <rdfs:label xml:lang="en">Steric hindrance</rdfs:label>
+    </owl:Class>
+
 </rdf:RDF>