ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/C6H18O2Si2.O2Si/c1-7-10(5,6)8-9(2,3)4;1-3-2/h1-6H3;/file?format=sdf&get3d=True -- InChI=1/C6H18O2Si2.O2Si/c1-7-10(5,6)8-9(2,3)4;1-3-2/h1-6H3; could not be loaded.