ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cc%28cc%28c1%29O%29C2CNC3%28O2%29CCCCCC3/file?format=sdf&get3d=True  -- c1cc%28cc%28c1%29O%29C2CNC3%28O2%29CCCCCC3 could not be loaded.