ERROR opening https://cactus.nci.nih.gov/chemical/structure/c3ccccc3C%28%3DCC2%29CCN2Cc1cnc%28C%29nc1N/file?format=sdf&get3d=True  -- c3ccccc3C%28%3DCC2%29CCN2Cc1cnc%28C%29nc1N could not be loaded.