ERROR opening https://cactus.nci.nih.gov/chemical/structure/COCCN%28C%29Cc1csc%28n1%29c1cn%28CCCCCF%29c2ccccc21/file?format=sdf&get3d=True  -- COCCN%28C%29Cc1csc%28n1%29c1cn%28CCCCCF%29c2ccccc21 could not be loaded.