ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28c1c%28cc%28OC%29c%28c1%29C2CC2N%29C%29C/file?format=sdf&get3d=True  -- O%28c1c%28cc%28OC%29c%28c1%29C2CC2N%29C%29C could not be loaded.