ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28COc1ccc%28Oc2ccccc2%29cc1%29Oc3ccccn3/file?format=sdf&get3d=True  -- CC%28COc1ccc%28Oc2ccccc2%29cc1%29Oc3ccccn3 could not be loaded.