Which of the following is not another representation for 2-methylbutane? 
Definitions:
Cigarette Smoking
The act of inhaling and exhaling the smoke produced by burning tobacco contained in cigarettes, which is known to be harmful to health.
Family History
The record of diseases or health conditions present in one's family, which can be important for assessing the risk of genetic disorders.
Serum Sodium
The concentration of sodium ions in the blood, essential for maintaining electrolyte balance and fluid regulation.
Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
A condition characterized by excessive release of antidiuretic hormone, leading to water retention and dilutional hyponatremia.
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