C6H10

from The Collaborative International Dictionary of English v.0.48

Hexine \Hex"ine\, n. [Gr. "e`x six.] (Chem.)
   A hydrocarbon, {C6H10}, of the acetylene series, obtained
   artificially as a colorless, volatile, pungent liquid; --
   called also {hexoylene}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Diallyl \Di*al"lyl\, n. (Chem.)
   A volatile, pungent, liquid hydrocarbon, {C6H10}, consisting
   of two allyl radicals.
   [1913 Webster]