ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%23C/C%28%3DN%5COCC1OCCO1%29c2ccccc2/file?format=sdf&get3d=True  -- N%23C/C%28%3DN%5COCC1OCCO1%29c2ccccc2 could not be loaded.