ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29NCC%28O%29COc1ccc%28cc1%29CCOCC2CC2/file?format=sdf&get3d=True  -- CC%28C%29NCC%28O%29COc1ccc%28cc1%29CCOCC2CC2 could not be loaded.