ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCNC1%3DNC%28NC%28C%29C%29%3DNC%28Cl%29%3DN1/file?format=sdf&get3d=True  -- CCNC1%3DNC%28NC%28C%29C%29%3DNC%28Cl%29%3DN1 could not be loaded.