9,10-dihydroxy-3-(pyrrolidin-1-ylcarbonyl)-1-oxa-2-azaspiro[4.5]deca-2,6-dien-8-one InChI=1/C13H16N2O5/c16-9-3-4-13(11(18)10(9)17)7-8(14-20-13)12(19)15-5-1-2-6-15/h3-4,10-11,17-18H,1-2,5-7H pyrrolidine, 1-[(9,10-dihydroxy-8-oxo-1-oxa-2-azaspiro[4.5]deca-2,6-dien-3-yl)carbonyl]-