ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BC-%5D%23%5BCr%5D.%5BC-%5D%23%5BCr%5D.%5BCr%2B2%5D/file?format=sdf&get3d=True  -- %5BC-%5D%23%5BCr%5D.%5BC-%5D%23%5BCr%5D.%5BCr%2B2%5D could not be loaded.