ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28c1cc%28cc%28OC%29c1OC%29C%28O%29Cc2ccc%28OC%29c%28O%29c2%29C/file?format=sdf&get3d=True  -- O%28c1cc%28cc%28OC%29c1OC%29C%28O%29Cc2ccc%28OC%29c%28O%29c2%29C could not be loaded.