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'