`CH_(3)-UNDERSET(CH_(3))underset(|)"CH"-CH_(2)-CH_(3)``CH_(3)-underset(CH_(3))underset(|)C=CH-CH_(3)``CH_(3)-CH_(2)-overset(CH_(3))overset(|)C=CH_(2)``CH_(3)-underset(CH_(3))underset(|)"CH"-CH=CH_(2)`
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