ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCC%3DCCC%3DCCCCCCCCC%28%3DO%29CC%28O%29COC%28%3DO%29C/file?format=sdf&get3d=True -- CCCCCC%3DCCC%3DCCCCCCCCC%28%3DO%29CC%28O%29COC%28%3DO%29C could not be loaded.