(3E)-3-[3-hydroxy-1-(hydroxymethyl)propylidene]piperazine-2,5-dione 2,5-piperazinedione, 3-[3-hydroxy-1-(hydroxymethyl)propylidene]-, (3E)- InChI=1/C8H12N2O4/c11-2-1-5(4-12)7-8(14)9-3-6(13)10-7/h11-12H,1-4H2,(H,9,14)(H,10,13)/b7-5