California Code, Health and Safety Code - HSC § 111225

(a) The name designated pursuant to Section 508 of the federal act (21 U.S.C. Sec. 358).

(b) If there is no such name and the drug or ingredient is an article recognized in an official compendium, then the official title in the compendium is the established name.

If neither subdivision (a) or (b) of this section applies, the common or usual name, if any, of the drug or of the ingredient is the established name. When an article is recognized in the United States Pharmacopoeia and in the Homeopathic Pharmacopoeia under different official titles, the official title used in the United States Pharmacopoeia shall apply unless it is labeled and offered for sale as a homeopathic drug. If it is labeled and offered for sale as a homeopathic drug, the official title used in the Homeopathic Pharmacopoeia shall apply.