ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1C%28C%28OC1N2C%3DNC3%3DC2NC%28%3DNC3%3DO%29N%29CO%29O/file?format=sdf&get3d=True  -- COC1C%28C%28OC1N2C%3DNC3%3DC2NC%28%3DNC3%3DO%29N%29CO%29O could not be loaded.