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Azulene is a molecule with 10 carbons and 8 hydrogens, consisting of a five-membered ring fused to a seven-membered ring. It is an isomer of naphthalene but its physical properties are quite different. Naphthalene is a white powder used in mothballs, whereas azulene, whose name is derived from the Spanish word azul, meaning "blue", is a dark blue liquid used in many cosmetics.
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