ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1cc%28C%29cc%28OC%29c1OC%28%3DO%29C%28CC%29N%28CCOC%29CCOC/file?format=sdf&get3d=True -- COc1cc%28C%29cc%28OC%29c1OC%28%3DO%29C%28CC%29N%28CCOC%29CCOC could not be loaded.