ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5BN%2B%5D%28C%29%28C%29CCC1%3DCNC2%3DC1C%3DC%28C%3DC2%29%5BO-%5D/file?format=sdf&get3d=True -- C%5BN%2B%5D%28C%29%28C%29CCC1%3DCNC2%3DC1C%3DC%28C%3DC2%29%5BO-%5D could not be loaded.