ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC2%3DC%28C%3DC1C%29N%28C3%3DNC%28%3DO%29NC%28%3DO%29C3%3DN2%29CC%28C%28C%28CO%29O%29O%29O/file?format=sdf&get3d=True -- CC1%3DCC2%3DC%28C%3DC1C%29N%28C3%3DNC%28%3DO%29NC%28%3DO%29C3%3DN2%29CC%28C%28C%28CO%29O%29O%29O could not be loaded.