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CH2CH3
₁ ₂ ₃ ₄Ι ₅ ₆ ₇ ₈ ₉ ₁₀ ₁₁
CH3 - CH - CH - CH - CH2 - CH2 - CH2 - CH2 - CH2 - CH2 - CH3
Ι Ι
CH3 CH3