Retinoids

**Definition:** A group of tetraterpenes, with four terpene units joined head-to-tail. Biologically active members of this class are used clinically in the treatment of severe cystic ACNE; PSORIASIS; and other disorders of keratinization.

**Tree numbers:** - D02.455.326.271.665.202.495 - D02.455.426.392.368.367.379.249.700 - D02.455.849.131.495 - D23.767.261.700

**Synonyms:** - Retinoid