InChI=1/C8H14O9P2/c1-13-18(11,14-2)5-6(8(10)17-7(5)9)19(12,15-3)16-4/h5-6H,1-4H phosphonic acid, (tetrahydro-2,5-dioxo-3,4-furandiyl)bis-, tetramethyl ester tetramethyl (2,5-dioxotetrahydrofuran-3,4-diyl)bis(phosphonate)