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Description:
{{organic compounds}} An unsaturated hydrocarbon, C<sub>5</sub>H<sub>8</sub>, that is readily polymerized; natural rubber (caoutchouc) is cis-1,4-polyisoprene, and trans-1,4-polyisoprene is present in gutta-percha and balata; it is the structural basis for the terpenes.
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isoprene
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Wiktionary
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