[Mg+2].[O-]C(=O)C.[O-]C(=O)C

InChI=1S/2C2H4O2.Mg/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 ^N
Key: UEGPKNKPLBYCNK-UHFFFAOYSA-L ^N

InChI=1/2C2H4O2.Mg/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
Key: UEGPKNKPLBYCNK-NUQVWONBAP