ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCOC%28%3DO%29c1ccc%28NCCCC%29cc1/file?format=sdf&get3d=True -- CN%28C%29CCOC%28%3DO%29c1ccc%28NCCCC%29cc1 could not be loaded.