ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28C%29%28OO%29OO+%28monomer%29%3Cbr+/%3ECCC%28C%29%28OO%29OOC%28C%29%28CC%29OO+%28dimer%29/file?format=sdf&get3d=True -- CCC%28C%29%28OO%29OO+%28monomer%29%3Cbr+/%3ECCC%28C%29%28OO%29OOC%28C%29%28CC%29OO+%28dimer%29 could not be loaded.