diff --git a/src/main/java/org/reactome/server/export/opentargets/model/EvidenceString.java b/src/main/java/org/reactome/server/export/opentargets/model/EvidenceString.java
index d8b12c9..dc6bfe2 100644
--- a/src/main/java/org/reactome/server/export/opentargets/model/EvidenceString.java
+++ b/src/main/java/org/reactome/server/export/opentargets/model/EvidenceString.java
@@ -32,11 +32,6 @@ public class EvidenceString {
     @JsonProperty(value = "disease", required = true)
     public EvidenceDisease evidenceDisease;
 
-    /**
-     * Added on demand for version 1.2.2 (18/02/2016)
-     */
-    public ProvenanceLiterature literature;
-
     public Evidence evidence;
 
     public EvidenceString(ReactomeEvidence reactomeEvidence) {
@@ -44,10 +39,6 @@ public EvidenceString(ReactomeEvidence reactomeEvidence) {
         this.evidenceDisease = new EvidenceDisease(reactomeEvidence);
         this.uniqueAssociationFields = new UniqueAssociationFields(reactomeEvidence);
         this.target = new Target(reactomeEvidence);
-        if (reactomeEvidence.getPubMedIdentifiers() != null && !reactomeEvidence.getPubMedIdentifiers().isEmpty()) {
-            //Following 1.2.2 specification, the provenance literature references have to be added ALSO at this level
-            this.literature = new ProvenanceLiterature(reactomeEvidence.getPubMedIdentifiers());
-        }
     }
 
     @Override