ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc3cccc%28c3%29C1%28CCCCC1%29N2CCCCC2/file?format=sdf&get3d=True  -- COc3cccc%28c3%29C1%28CCCCC1%29N2CCCCC2 could not be loaded.