The Hill System (or Hill notation) is a method of writing empirical chemical formulas, molecular chemical formulas and components. It is used in command language search interfaces such as the STN database in order to enter a molecular formula into a text box.
"Reject the water of crystallization, and rewrite the empirical formula in the alphabetical order of the chemical symbols, except that in carbon compounds write C first and H second; follow this rewritten formula with the constitutional formula, when given, adding the water of crystallization, if any, but arrange the titles alphabetically by the rewritten formula." (p. 480)
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