ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1cccc3c1N4C%28c2ccccc2C3%29CN%28C%29CC4/file?format=sdf&get3d=True  -- n1cccc3c1N4C%28c2ccccc2C3%29CN%28C%29CC4 could not be loaded.