aminolevulinic acid

noun

ami·​no·​lev·​u·​lin·​ic acid ə-ˌmē-nō-ˌlev-yə-ˌli-nik- 

variants also 5-aminolevulinic acid

: a drug applied to the face and scalp in the form of its hydrochloride C₅H₉NO₃·HCl to make the skin sensitive to light in photodynamic treatment especially of actinic keratoses

—abbreviation ALA

Note: Aminolevulinic acid is marketed under the trademark Levulan.