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Guaiazulene, also azulon or 1,4-dimethyl-7-isopropylazulene, is a dark blue crystalline hydrocarbon. A derivative of azulene, guaiazulene is a bicyclic sesquiterpene that is a constituent of some essential oils, mainly oil of guaiac and chamomile oil, which also serve as its commercial sources. Various soft corals also contain guaiazulene as a principal pigment. Its low melting point makes guaiazulene difficult to handle, in contrast to the crystalline nature of the parent azulene. The electronic structure of guaiazulene and azulene are very similar.

A hatstand (UK), hatrack (US), coat rack, coat stand, hat tree, hall tree, or portmanteau is a device used to store hats and often coats on, and umbrellas within. A coat rack often refers to a set of hooks that are attached to a wall. Usually made of wood or metal and standing at least 5 feet (1.5 m) tall, the self-standing variant is more often referred to as a hatstand and has a single pole, a sturdy base to prevent toppling, and an array of lengthy pegs at the top for placement of hats. A hatrack was used to decorate Victorian front halls while providing storage.

The 902d Troop Carrier Group is an inactive United States Air Force Reserve unit. It was last active with the 94th Troop Carrier Wing at Grenier Air Force Base, Massachusetts, where it was inactivated on 25 January 1966.