It works under the SRS system and is described here .
Title Contains the title for experiment or analysis described in the entry.
Compound Describes the macromolecules contained in the entry. This specialized field is not present in the entry as a separate line. This specialized field is not present in the entry as a separate line. EC Contains the Enzyme Commission number associated with the molecule. If there is more than one EC number, they are presented as a comma-separated list.