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Polycyclic organic compounds, www.sigmaaldrich.com, Aromatic compounds, Aromatic compound

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CHRYSENE (65996-93-2, 50-32-8, 218-01-9)  
Chrysene is a polycyclic aromatic hydrocarbon (PAH) with the molecular formula C 18H 12 that consists of four fused benzene rings. It is a natural constituent of coal tar, from which it was first isolated and characterized. It is also found in creosote at levels of 0.5-6 mg/kg.
Benz[a]anthracene (56-55-3)  
benzanthracene  ·  benzo(b)phenanthrene  ·  1,2-benzanthracene
Benz[a]anthracene or benzo[a]anthracene is a polycyclic aromatic hydrocarbon with the chemical formula C18H12. In February 2014, NASA announced a greatly upgraded database for tracking polycyclic aromatic hydrocarbons (PAHs), including benz[a]anthracene, in the universe. According to scientists, more than 20% of the carbon in the universe may be associated with PAHs, possible starting materials for the formation of life.
Acenaphthenequinone (82-86-0)  
Acenaphthoquinone is a quinone derived from acenaphthene. It is insoluble in water, but soluble in alcohol. It is used as an intermediate for the manufacturing of dyes, pharmaceuticals and pesticides.
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