ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cc2cccc3c2c%28c1%29C%28%3DO%29N%28C3%3DO%29CCCC%28%3DO%29O/file?format=sdf&get3d=True -- c1cc2cccc3c2c%28c1%29C%28%3DO%29N%28C3%3DO%29CCCC%28%3DO%29O could not be loaded.