Resins derived from Coumarone (Benzofuran) and indene are also produced. Chemically, dronedarone is a benzofuran derivative related to amiodarone, a popular antiarrhythmic. For example, psoralen is a benzofuran derivative that occurs in several plants. The molecule contains a benzofuran element associated with a benzylidene linked in position 2. Benzofuran is the heterocyclic compound consisting of fused benzene and furan rings. Benzofuran reacts preferentially in the furan ring rather than in the benzene ring. Benzofuran is the "parent" of many related compounds with more complex structures.