👉 A polycyclic molecule is a molecule that contains more than one cyclic ring. A cyclic ring is a group in which every element can be written as a power of another element, and where all elements are relatively prime to each other. In other words, it's a ring with the property that for any two elements, their product is equal to the product of their powers. Polycyclic molecules have special properties due to the presence of cyclic rings in their structure. For example, consider the molecule