ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC/2Oc1cc%28OC%29cc%28c1C%28%5COC%29%3DC%5C2%29C/file?format=sdf&get3d=True -- O%3DC/2Oc1cc%28OC%29cc%28c1C%28%5COC%29%3DC%5C2%29C could not be loaded.