SEARCH Articles Figures Tables Polycyclic Hydrocarbons, Nonalternant Compounds with Five Fused Rings Polycyclic Hydrocarbons, Nonalternant Compounds with Four Fused Rings Polycyclic Hydrocarbons, Nonalternant Compounds with Fused Rings Polycyclic Hydrocarbons, Nonalternant Compounds with More Than Five Fused Rings Polycyclic Hydrocarbons, Nonalternant Compounds with Two or Three Fused Rings Union Monocyclic Nonalternant Hydrocarbons