A 4112 (OTTO) 5-Aminolevulinic acid hydrochloride, ≥98% Cas 5451-09-2 - used to activate or inhibit heme biosynthesis in HeLa and K562 cell lines. A 4112 (OTTO) 5-Aminolevulinic acid hydrochloride, ≥98% Cas 5451-09-2 - used in photodynamic therapy for A431 tumor bearing mice.