5-Amino-3-oxopentanoic acid (hydrochloride) 5-Aminolevulinate hydrochloride 5-Aminolevulinic acid hydrochloride 5451-09-2 Aminolevulinic acid hydrochloride EINECS 226-679-5 Levulan Kerastick Levulinic acid, 5-amino-, hydrochloride (8CI) NSC 18509 Pentanoic acid, 5-amino-4-oxo-, hydrochloride aminolevulinic acid delta-Aminolevulinic acid hydrochloride