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valylene

ˈvalylene Chem.
  [f. as prec. + -ene.]
  (See quots.)

1868 Watts Dict. Chem. V. 982 Valylene... This hydrocarbon is found..among the products of the action of alcoholic potash on dibromide of valerylene. 1868 Fownes' Chem. (ed. 10) 564 Quintone or Valylene.

Oxford English Dictionary

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