The following DataNodes have no identifier: 4
http://classic.wikipathways.org/instance/WP4701_r117377 http://rdf.wikipathways.org/Pathway/WP4701_r117377/DataNode/a33af ((+)-Isomenthol)
http://classic.wikipathways.org/instance/WP4701_r117377 http://rdf.wikipathways.org/Pathway/WP4701_r117377/DataNode/f1351 ((+)-Neoisomenthol)
http://classic.wikipathways.org/instance/WP4701_r117377 http://rdf.wikipathways.org/Pathway/WP4701_r117377/DataNode/e2345 (ISPD)
http://classic.wikipathways.org/instance/WP4701_r117377 http://rdf.wikipathways.org/Pathway/WP4701_r117377/DataNode/fca53 (ISPI)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier