ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/B6Si/c1-2-5-3(1)7(5)4(1)6(2)7/file?format=sdf&get3d=True  -- InChI=1S/B6Si/c1-2-5-3(1)7(5)4(1)6(2)7 could not be loaded.