C18H26O

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C18H26O is a chemical formula for molecules that contain 18 carbon atoms, 26 hydrogen atoms, and 1 oxygen atom. Its molar mass is 258.40 g/mol and the exact mass is 258.1984 u. Because many different structures can have this same formula, C18H26O may refer to several different compounds (isomers). The formula alone doesn’t identify a specific substance; you need the actual structure or name to know which compound it is.