ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1CCOC%28C2%3DCC%3DCC%3DC2C1%29C3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True  -- CN1CCOC%28C2%3DCC%3DCC%3DC2C1%29C3%3DCC%3DCC%3DC3 could not be loaded.