| PubChem=7219 | SMILES=C1C=CC2=CC=CC=C21 }} |Section2= |Section3= }} Indene's a flammable polycyclic hydrocarbon with chemical formula C9H8. It's composed of a benzene ring fused with a cyclopentene ring. This aromatic liquid's colorless although samples often are pale yellow. The principal industrial use of indene's in the production of indene/cumarone thermoplastic resins. Isolation Indene occurs naturally in coal-tar fractions boiling around 175-185 °C. It can be obtained by heating th… (More on Indene)