👉 Pyrenoids are a group of organic compounds that have a ring system around their central carbon atom. These rings, known as pyrrolic or pyranocyclic rings, are composed of two or more substituents and can be found in various natural products including oils, alcohols, and pigments. In organic chemistry, the term "pyrenoid" is used to describe a molecule that contains at least one pyrrole (a type of ring system) as its central