pen·tyl·ene·tet·ra·zol 
(pĕntə-lēn′tĕtrə-zôl′, -zōl′, -zŏl′)
(pĕntə-lēn′tĕtrə-zôl′, -zōl′, -zŏl′)n.
A drug, C6H10N4, that is a central nervous system and respiratory stimulant, used experimentally primarily to induce seizures for pharmaceutical research.
[PENT(A)- + (METH)YLENE + TETR(A)- + AZ(O)- + -OL(E).]