ERROR opening https://cactus.nci.nih.gov/chemical/structure/C/C%28%3DN/NC%28%3DO%29c1ccncc1%29/c2ccco2/file?format=sdf&get3d=True  -- C/C%28%3DN/NC%28%3DO%29c1ccncc1%29/c2ccco2 could not be loaded.