L-Leucyl-L-Leucine methyl ester (LLOMe) hydrochloride, a dipeptide condensation product of L-leucine methyl ester generated by human monocytes or polymorphonuclear leukocytes, selectively eliminates lymphocytes with cytotoxic potential. L-Leucyl-L-Leucine methyl ester hydrochloride also can induce endolysosomal pathway stress[1][2][3].