(3Z)-3-(2-hydroxyethylidene)piperazine-2,5-dione 2,5-piperazinedione, 3-(2-hydroxyethylidene)-, (3Z)- InChI=1/C6H8N2O3/c9-2-1-4-6(11)7-3-5(10)8-4/h1,9H,2-3H2,(H,7,11)(H,8,10)/b4-1