C5H8

from The Collaborative International Dictionary of English v.0.48
Isoprene \I"so*prene\, n. [Etymol. uncertain.] (Chem.)
   An oily, volatile unsaturated hydrocarbon ({C5H8}), obtained
   by the distillation of caoutchouc or gutta-percha, and used
   to make synthetic rubber by polymerization. In organic
   chemistry, it is viewed conceptually as the building block of
   the terpene series of hydrocarbons.
   [1913 Webster +PJC]
from The Collaborative International Dictionary of English v.0.48
Pentine \Pen"tine\, n. [See {Penta-}.] (Chem.)
   An unsaturated hydrocarbon, {C5H8}, of the acetylene series.
   Same as {Valerylene}.
   [1913 Webster]
from The Collaborative International Dictionary of English v.0.48
Valerylene \Val`er*yl*ene\, n. (Chem.)
   A liquid hydrocarbon, {C5H8}; -- called also {pentine}.
   [1913 Webster]
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