ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%5CC%28%3DN/C1CCCCC1%29%5COc2cccc%28c2%29c3cccc%28c3%29C%28%3DN%29O/file?format=sdf&get3d=True -- O%5CC%28%3DN/C1CCCCC1%29%5COc2cccc%28c2%29c3cccc%28c3%29C%28%3DN%29O could not be loaded.