45.13 Product Class 13: Biaryls
45.14 Product Class 14: Arylalkanes
45.15 Product Class 15: Poly(phenylenes)
45.16 Product Class 16: Poly(p-phenylenevinylenes)
45.17 Product Class 17: Poly(xylylenes)
45.18 Product Class 18: Polystyrenes
45.19 Product Class 19: Naphthalenes, Anthracenes, 9H-Fluorenes, and Other Acenes
45.20 Product Class 20: Cyclobutabenzenes, Biphenylenes, and [N]Phenylenes
45.21 Product Class 21: Phenanthrenes, Helicenes, and Other Angular Acenes
45.22 Product Class 22: Pyrenes, Circulenes, and Other Condensed Acenes
45.23 Product Class 23: Annulated Polycyclic Aromatic Hydrocarbons
45.24 Product Class 24: Pentalenes, s-Indacenes, as-Indacenes, Azulenes, and Heptalenes, and Their Benzo Derivatives
45.25 Product Class 25: Extended Polyaromatic Hydrocarbons: Graphite, Fullerene, and Carbon Nanotube Substructures
45.26 Product Class 26: Triphenylenes, Tetraphenylenes, and Related Compounds
45.27 Product Class 27: Calixarenes
45.28 Product Class 28: Mononuclear Cyclophanes
45.29 Product Class 29: Polynuclear Cyclophanes
45.30 Product Class 30: Conjugated Polyenes, Including Cyclic Polyenes That Are Not Fully Conjugated
45.31 Product Class 31: Macromolecular Conjugated Polyenes
