InChI=1S/2C6H8O7.C4H6O5.4Ca/c2*7-3(8)1-6(13,5(11)12)2-4(9)10;5-2(4(8)9)1-3(6)7;;;;/h2*13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);2,5H,1H2,(H,6,7)(H,8,9);;;;/q;;;4*+2/p-8