InChI=1/C16H16N2O6/c19-11-5-1-9(2-6-11)17-15(23)13(21)14(22)16(24)18-10-3-7-12(20)8-4-10/h1-8,13-14,19-22H,(H,17,23)(H,18,24)/t13-,14+/f/h17-18H 5F1B8DA139319420