InChI=1S/C16H10O12S4.4Na/c17-29(18,19)11-5-13(31(23,24)25)9-3-4-10-14(32(26,27)28)6-12(30(20,21)22)8-2-1-7(11)15(9)16(8)10;;;;/h1-6H,(H,17,18,19)(H,20,21,22)(H,23,24,25)(H,26,27,28);;;;/q;4*+1/p-4