ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1C%28CC2%3DCC3%3DC%28C%3DC21%29OCO3%29N/file?format=sdf&get3d=True  -- C1C%28CC2%3DCC3%3DC%28C%3DC21%29OCO3%29N could not be loaded.