ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCn1cc%28c2c1cccc2%29Cc3ccc%28c4c3cccc4%29C/file?format=sdf&get3d=True  -- CCCCCn1cc%28c2c1cccc2%29Cc3ccc%28c4c3cccc4%29C could not be loaded.