ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BLi%2B%5D.C%5BCH2-%5D%2C%20%5BLi%5D.C%5BCH2%5D/file?format=sdf&get3d=True  -- %5BLi%2B%5D.C%5BCH2-%5D%2C%20%5BLi%5D.C%5BCH2%5D could not be loaded.