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1 : Nameless @ Open 2015/07/03 (Friday) 17:43:03 ID: qj5 Heptane or n-heptane (normal, n-heptane) is a linear alkane represented by the formula CH3 (CH2) 5CH3, and is a substance that serves as an index of 0 octane number. Appearance is a colorless liquid with a volatile and petroleum-like odor. Sometimes a generic term for isomers. Related article document.write(” + ”);