ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1cc%28C%28%3DO%29NCC%28%3DO%29O%29ccc1O/file?format=sdf&get3d=True  -- COc1cc%28C%28%3DO%29NCC%28%3DO%29O%29ccc1O could not be loaded.