ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1cc%28cc%28c1OC%29OC%29C%28%3DO%29NC2CCCNC2/file?format=sdf&get3d=True  -- COc1cc%28cc%28c1OC%29OC%29C%28%3DO%29NC2CCCNC2 could not be loaded.