ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28CCN%28C%29C%29C%28c1ccccc1%29c2ccc%28cc2%29C/file?format=sdf&get3d=True  -- O%28CCN%28C%29C%29C%28c1ccccc1%29c2ccc%28cc2%29C could not be loaded.