pentaerythritol tetranitrate
noun
pen·ta·eryth·ri·tol tet·ra·ni·trate
ˌpen-tə-i-ˈri-thrə-ˌtȯl-ˌte-trə-ˈnī-ˌtrāt
-trət,
-ˌtōl-
: petn
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Merriam-Webster unabridged
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