Assigns chemical named entity tags to terms which are recognized by the OSCAR chemical named entity recognizer framework version 4.1.2 (see https://bitbucket.org/wwmm/oscar4/overview for details). As tags the default named entity types of the OSCAR framework are used (see http://apidoc.ch.cam.ac.uk/oscar4-4.0.1/). The OSCAR tag filter is afterwards able to filter the assigned tags.