ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCOC%28%3DO%29C1%3DCC2%3DC%28C%3DC1%29NC3%3DC2CSCC3/file?format=sdf&get3d=True -- CN%28C%29CCOC%28%3DO%29C1%3DCC2%3DC%28C%3DC1%29NC3%3DC2CSCC3 could not be loaded.