different between pentacene vs pentaene

English

penta- +? acene

pentacene (countable and uncountable, plural pentacenes)

(organic chemistry) A polycyclic aromatic hydrocarbon; the acene containing five fused rings.

From penta- +? -ene

pentaene (plural pentaenes)

(organic chemistry, especially in combination) Any compound having five carbon-carbon double bonds
(steroid chemistry) An intermediate (unreduced) product in Torgov steroid synthesis

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