ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H18Si2/c1-7(2,3)8(4,5)6/h1-6H3/file?format=sdf&get3d=True  -- InChI=1S/C6H18Si2/c1-7(2,3)8(4,5)6/h1-6H3 could not be loaded.