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