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Nitroglycerin, also known as nitroglycerine (UK spelling), trinitroglycerin, trinitroglycerine, 1,2,3-trinitroxypropane and glyceryl trinitrate, is a heavy, colorless, oily, explosive liquid obtained by nitrating glycerol. It is very dangerous and easy to detonate. It was synthesized in 1847 by Italian chemist Ascanio Sobrero. Alfred Nobel used it to make one of the most famous explosives in the world during 1867, named dynamite.

Nitroglycerin is also used in drugs for vasodilation. It is used for various heart conditions, including Angina pectoris. It is often used in emergencies for various other conditions that require a widening of blood vessels.

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