ERROR opening https://cactus.nci.nih.gov/chemical/structure/O3C%28c1ccccc1%29%28c2ccccc2%29C%28CN%28C%29C%29CC3/file?format=sdf&get3d=True  -- O3C%28c1ccccc1%29%28c2ccccc2%29C%28CN%28C%29C%29CC3 could not be loaded.