ERROR opening https://cactus.nci.nih.gov/chemical/structure/c2c%28O%29cc%28O%29cc2Oc1c%28O%29cc%28O%29cc1O/file?format=sdf&get3d=True  -- c2c%28O%29cc%28O%29cc2Oc1c%28O%29cc%28O%29cc1O could not be loaded.