ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5BN%2B%5D%28C%29%28C%29CCOc1cccc%28c1%29Br/file?format=sdf&get3d=True -- C%5BN%2B%5D%28C%29%28C%29CCOc1cccc%28c1%29Br could not be loaded.