ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCC%28%3DO%29N%28C2CCN%28CCc1ccccc1%29CC2%29c3ccccc3/file?format=sdf&get3d=True  -- CCCC%28%3DO%29N%28C2CCN%28CCc1ccccc1%29CC2%29c3ccccc3 could not be loaded.