ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28N%3DNc2ccccc2%29C%28%3DO%29N%28N1%29c3ccccc3/file?format=sdf&get3d=True -- CC1%3DC%28N%3DNc2ccccc2%29C%28%3DO%29N%28N1%29c3ccccc3 could not be loaded.