ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1C%28%3DO%29C%28%3DNNC%28%3DS%29N%29c2ccccc12/file?format=sdf&get3d=True  -- CN1C%28%3DO%29C%28%3DNNC%28%3DS%29N%29c2ccccc12 could not be loaded.