ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1C%28CC2%3DC1C%3DC3C%3DCOC3%3DC2%29N/file?format=sdf&get3d=True  -- C1C%28CC2%3DC1C%3DC3C%3DCOC3%3DC2%29N could not be loaded.