Enables hydroxyacylglutathione hydrolase activity. Predicted to be involved in carbohydrate metabolic process and glutathione biosynthetic process. Predicted to act upstream of or within methylglyoxal catabolic process to D-lactate via S-lactoyl-glutathione. Located in mitochondrion. Is expressed in several structures, including alimentary system; brain; genitourinary system; respiratory system; and sensory organ. Orthologous to human HAGH (hydroxyacylglutathione hydrolase). [provided by Alliance of Genome Resources, Apr 2022]