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You can also search by the Molecular Formula, which is a list of atom symbols and atom counts pertaining to one formula unit. Molecular Formulas are written in Hill System Order. For substances containing both carbon and hydrogen atoms, the Molecular Formula starts with the carbon- and hydrogen atom counts. All other elements are then listed alphabetically. For multi-component substances, all components are indexed separately. When stoichiometric factors precede the component Molecular Formula , they are not considered for the Molecular Formula index.
Example 1: C8H9AsNNaO5 is the indexed Molecular Formula for Acetarsol.
Example 2: The Molecular Formula of Timolol Maleate is C13H24N4O3S · C4H4O4. There are two index entries for this substance: C13H24N4O3S and C4H4O4.
Example 3: The Molecular Formula of Amodiaquine dihydrochloride dihydrate is C20H22ClN3O · 2HCl · 2H2O. There are three Molecular Formula index entries for this compound: C20H22ClN3O, HCl and H2O.