Leucomalachite green-d5 is the deuterated derivative of Leucomalachite green (HY-D0300). Leucomalachite green is the major reduced metabolite of malachite green (MG) and has lower cytotoxicity (such as HEp-2 and Caco-2) than malachite green. Leucomalachite green may be involved in interfering with cell metabolism or redox balance and can be used to evaluate its potential harm to human cells as a food contaminant[1][2].