ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%3DCCOc1c%28OC%29cc%28cc1OC%29CC%28N%29C/file?format=sdf&get3d=True  -- C%3DCCOc1c%28OC%29cc%28cc1OC%29CC%28N%29C could not be loaded.