ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29C%28%3DO%29c1cc2cnc%28nc2n1C3CCCC3%29Nc4ccc%28cn4%29N5CCNCC5/file?format=sdf&get3d=True -- CN%28C%29C%28%3DO%29c1cc2cnc%28nc2n1C3CCCC3%29Nc4ccc%28cn4%29N5CCNCC5 could not be loaded.