ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1cn%28nc1%29Cc2cc3c%28cc2%29ncc3CCN%28C%29C/file?format=sdf&get3d=True  -- n1cn%28nc1%29Cc2cc3c%28cc2%29ncc3CCN%28C%29C could not be loaded.