ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%28%3DN/c1ccccc1%29%5Cc2ccc%28N%28C%29C%29cc2/file?format=sdf&get3d=True  -- N%28%3DN/c1ccccc1%29%5Cc2ccc%28N%28C%29C%29cc2 could not be loaded.