ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3Dn2nn%28%3DO%29nc1c2nn%28%3DO%29nn1%3DO/file?format=sdf&get3d=True  -- O%3Dn2nn%28%3DO%29nc1c2nn%28%3DO%29nn1%3DO could not be loaded.