ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BSiH3%5D%20%5BSiH2%5D%20%5BSiH3%5D/file?format=sdf&get3d=True  -- %5BSiH3%5D%20%5BSiH2%5D%20%5BSiH3%5D could not be loaded.