ERROR opening https://cactus.nci.nih.gov/chemical/structure/n2c1ccc%28Cl%29cc1nc2C%28%3DO%29N3CCN%28C%29CC3/file?format=sdf&get3d=True  -- n2c1ccc%28Cl%29cc1nc2C%28%3DO%29N3CCN%28C%29CC3 could not be loaded.