ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28c1cc%28OC%29c%28cc1OC%29CC%28N%29C%29CC/file?format=sdf&get3d=True  -- O%28c1cc%28OC%29c%28cc1OC%29CC%28N%29C%29CC could not be loaded.