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