ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1O%5BPt-2%5D%28%5BNH3%2B%5D%29%28%5BNH3%2B%5D%29OC1/file?format=sdf&get3d=True  -- O%3DC1O%5BPt-2%5D%28%5BNH3%2B%5D%29%28%5BNH3%2B%5D%29OC1 could not be loaded.