Data items in the ENTITY_NAME_SYS category record the systematic name or names associated with the entity, and tell which system was is the source of the systematic name. In some cases, the entity name may not be the same as the name of the biological structure. For instance, hemoglobin alpha chain would be the entity common name, not hemoglobin.
loop_ _entity_name_sys.entity_id _entity_name_sys.name 1 ECx.x.x.x 2 'acetyl-Ile-Val-Asp-Sta-Ala-Ile-Sta' 3 'H(2)0'