ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DS%28%3DO%29%28Nc1ncc%28nc1OC%29C%29c4cccnc4c3ccc%28c2nnco2%29cc3/file?format=sdf&get3d=True  -- O%3DS%28%3DO%29%28Nc1ncc%28nc1OC%29C%29c4cccnc4c3ccc%28c2nnco2%29cc3 could not be loaded.