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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