ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CC2C%28CC3%3DCNC4%3DCC%3DCC2%3DC34%29NC1/file?format=sdf&get3d=True  -- C1CC2C%28CC3%3DCNC4%3DCC%3DCC2%3DC34%29NC1 could not be loaded.