ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1c2c%28cc%28c1F%29N3CCNCC3%29n%28cc%28c2%3DO%29C%28%3DO%29O%29C4CC4/file?format=sdf&get3d=True  -- c1c2c%28cc%28c1F%29N3CCNCC3%29n%28cc%28c2%3DO%29C%28%3DO%29O%29C4CC4 could not be loaded.