A tetrapyrrole fundamental parent that consists of two pyrrole and two reduced pyrrole units connected by methine linkages, where the two reduced pyrroles are located diagonally opposite one another.
Stars
This entity has been manually annotated by the ChEBI Team.
An organic molecule or ion (usually a metal ion) that is required by an enzyme for its activity. It may be attached either loosely (coenzyme) or tightly (prosthetic group).