different between heptacene vs heptaene

English

hept- +? acene

heptacene (countable and uncountable, plural heptacenes)

(organic chemistry) The acene consisting of seven fused benzene rings; any derivative of this compound.

hepta- +? -ene

heptaene (plural heptaenes)

(organic chemistry) Any unsaturated aliphatic hydrocarbon having seven double bonds

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