pentylenetetrazol
noun
pen·tyl·ene·tet·ra·zol
ˌpen-tə-ˌlēn-ˈte-trə-ˌzȯl
-ˌzōl
: a white, crystalline drug C6H10N4 formerly used as a respiratory, circulatory, and central nervous system stimulant
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Merriam-Webster unabridged
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