ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28N%29CC1%3DCNC2%3DCC%3DCC%28O%29%3DC12/file?format=sdf&get3d=True  -- CC%28N%29CC1%3DCNC2%3DCC%3DCC%28O%29%3DC12 could not be loaded.