ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1Nc2ccc%28Cl%29cc2C%28c2ccccc2%29%3DNC1O/file?format=sdf&get3d=True  -- O%3DC1Nc2ccc%28Cl%29cc2C%28c2ccccc2%29%3DNC1O could not be loaded.