ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BCu%2B%5D.%5BCu%2B%5D.%5BCu%2B%5D.%5BPH6-3%5D/file?format=sdf&get3d=True  -- %5BCu%2B%5D.%5BCu%2B%5D.%5BCu%2B%5D.%5BPH6-3%5D could not be loaded.