ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC1CC2C%28OC1%28C%29C%28O%29C2%29%28C%29C/file?format=sdf&get3d=True  -- OC1CC2C%28OC1%28C%29C%28O%29C2%29%28C%29C could not be loaded.