ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/2Mg.O8Si3/c;;1-9(2)7-11(5,6)8-10(3)4/q2* 2;-4/file?format=sdf&get3d=True  -- InChI=1S/2Mg.O8Si3/c;;1-9(2)7-11(5,6)8-10(3)4/q2* 2;-4 could not be loaded.