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