ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%26%2391%3BPt%26%2393%3B%28O%29%28O%29O/file?format=sdf&get3d=True  -- O%26%2391%3BPt%26%2393%3B%28O%29%28O%29O could not be loaded.