ERROR opening https://cactus.nci.nih.gov/chemical/structure/Br.CCn1c2cc%28%3DN%29ccc-2c2ccc%28N%29cc2c1-c1ccccc1/file?format=sdf&get3d=True -- Br.CCn1c2cc%28%3DN%29ccc-2c2ccc%28N%29cc2c1-c1ccccc1 could not be loaded.