Cal. Health & Saf. Code § 11033 : CALIFORNIA HEALTH AND SAFETY CODE — UNIFORM CONTROLLED SUBSTANCES ACT — GENERAL PROVISIONS AND DEFINITIONS — "Isomer" defined TEXT PDF As used in this division, except as otherwise defined, the term "isomer" includes optical and geometrical (diastereomeric) isomers. Ca. Health and Saf. Code § 11033 Added by Stats. 1985, Ch. 21, Sec. 2. Effective April 2, 1985.