ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28c1ccc%28cc1OC%29CCNCC%28O%29COc2cc%28ccc2%29C%29C/file?format=sdf&get3d=True  -- O%28c1ccc%28cc1OC%29CCNCC%28O%29COc2cc%28ccc2%29C%29C could not be loaded.