ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1C%28%3DO%29C%28%3DNNC%28N%29%3DS%29c2ccccc21/file?format=sdf&get3d=True  -- CN1C%28%3DO%29C%28%3DNNC%28N%29%3DS%29c2ccccc21 could not be loaded.