ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1cc2CN%28%3DO%29%28C%29CCc2c%28c1OC%29OC/file?format=sdf&get3d=True  -- COc1cc2CN%28%3DO%29%28C%29CCc2c%28c1OC%29OC could not be loaded.