ERROR opening https://cactus.nci.nih.gov/chemical/structure/C/C%3DC/C1%3DCC%3DC2C%28OCO2%29%3DC1/file?format=sdf&get3d=True  -- C/C%3DC/C1%3DCC%3DC2C%28OCO2%29%3DC1 could not be loaded.