Indeno is a chemical compound that is commonly used as a starting material for the synthesis of various organic compounds. It is an aromatic hydrocarbon that has two benzene rings fused together with a cyclopentadiene ring. There are several synonyms that can be used to refer to indeno, including indenoperylene, indeno[2,1-c]fluorene, and 5,6-benzoindene. These terms are often used interchangeably in the scientific literature and in chemical databases. Understanding these synonyms is important for researchers who work with indeno and need to accurately identify and characterize the compound in their experiments.