ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CC2%28C1%29C%28%3DO%29O%5BPt%5DOC2%3DO.N.N/file?format=sdf&get3d=True  -- C1CC2%28C1%29C%28%3DO%29O%5BPt%5DOC2%3DO.N.N could not be loaded.