InChI=1S/C18H15NO8S2.2Na.H2O/c20-28(21,22)26-15-8-4-13(5-9-15)18(17-3-1-2-12-19-17)14-6-10-16(11-7-14)27-29(23,24)25;;;/h1-12,18H,(H,20,21,22)(H,23,24,25);;;1H2/q;2*+1;/p-2