ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DNC2%3DCC%3DCC%3DC2C%28%3DO%29N1C3%3DCC%3DCC%3DC3OC/file?format=sdf&get3d=True -- CC1%3DNC2%3DCC%3DCC%3DC2C%28%3DO%29N1C3%3DCC%3DCC%3DC3OC could not be loaded.