ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DCC%28%3DC%28C%3DC1C2CCNC2%29OC%29Br/file?format=sdf&get3d=True  -- COC1%3DCC%28%3DC%28C%3DC1C2CCNC2%29OC%29Br could not be loaded.