ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1nnc%28o1%29C/3%3DC/C%3D4CN%28Cc2ccccc2%29CCC%3D4NC%5C3%3DO/file?format=sdf&get3d=True -- COc1nnc%28o1%29C/3%3DC/C%3D4CN%28Cc2ccccc2%29CCC%3D4NC%5C3%3DO could not be loaded.