ERROR opening https://cactus.nci.nih.gov/chemical/structure/n2c%28OCCCN%28C%29C%29c1ccccc1n2Cc3ccccc3/file?format=sdf&get3d=True  -- n2c%28OCCCN%28C%29C%29c1ccccc1n2Cc3ccccc3 could not be loaded.