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PETN (Pentaerythritol Tetranitrate) is one of the strongest known high explosives. It is more sensitive to shock or friction than TNT or tetryl, and it is never used alone as a booster. It is primarily used in booster and bursting charges of small caliber ammunition, in upper charges of detonators in some land mines and shells, and as the explosive core of primacord[?].

PETN is also used as a vasodilator.

PETN formula is C(CH2ONO2)4. It melts toward 141C. Its preparation involves nitration of pentaerythritol with a mixture of concentrated nitric and sulfuric acid.
C(CH2OH)4 + 4HNO3 -> C(CH2ONO2)4 + 4H2O

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