ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%3DCC1%3DC2CCOC%28%3DO%29C2%3DCN%3DC1/file?format=sdf&get3d=True  -- C%3DCC1%3DC2CCOC%28%3DO%29C2%3DCN%3DC1 could not be loaded.