ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BCr%2B2%5D.%5BcH-%5D1cccc1.c1%5BcH-%5Dccc1/file?format=sdf&get3d=True  -- %5BCr%2B2%5D.%5BcH-%5D1cccc1.c1%5BcH-%5Dccc1 could not be loaded.