ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OC%29C/1%3DC/CC3c2n%5C1c4ccccc4c2CCN3CC/file?format=sdf&get3d=True -- O%3DC%28OC%29C/1%3DC/CC3c2n%5C1c4ccccc4c2CCN3CC could not be loaded.