ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%23Cc1ccc%28cc1%29C%28c2ccc%28C%23N%29cc2%29n3ncnc3/file?format=sdf&get3d=True  -- N%23Cc1ccc%28cc1%29C%28c2ccc%28C%23N%29cc2%29n3ncnc3 could not be loaded.