ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1c2c3ccccc3n%28C%29c2CCC1Cn4ccnc4C/file?format=sdf&get3d=True  -- O%3DC1c2c3ccccc3n%28C%29c2CCC1Cn4ccnc4C could not be loaded.