Take the BC5CDR corpus as an example, in ‘Famotidine is a histamine H2-receptor antagonist used in inpatient settings for prevention of stress ulcers...’ (PMID: 8701013, words in bold are disease/chemical entities given by the corpus), our method successfully extracted the relation of ‘Famotidine’ (MeSH: D015738) and ‘ulcers’ (MeSH: D014456) but cannot distinguish the difference between prevention relation and CID relation. The gene discussed is HRH2; the disease is ulcer disease.