21. The modified Danheiser benzannulation allows the synthesis of polycyclic aromatic and heteroaromatic systems. 22. Other polycyclic aromatics undergo anthracene-like photocycloaddition, such as acridizinium salts. 23. Words like particulates, benzene and polycyclic aromatic hydrocarbons pop up in her speech. 24. Hydrocarbons are also abundant in nebulae forming polycyclic aromatic hydrocarbon ( PAH ) compounds. 25. Tobacco smoke contains over fifty known carcinogens, including nitrosamines and polycyclic aromatic hydrocarbons. 26. Polycyclic aromatic hydrocarbons ( PAH ), for example, are genotoxic via epoxidation.27. Clearly, a strongly polycyclic group is polycyclic. 28. Clearly, a strongly polycyclic group is polycyclic . 29. "' Sanguinarine "'is a toxic polycyclic quaternary ammonium salt. 30. Type IV kerogen contains mostly decomposed organic matter in the form of polycyclic aromatic hydrocarbons.
