ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28c4ccccc4OCCNCC%28O%29COc3cccc2c3c1c%28cccc1%29n2%29C/file?format=sdf&get3d=True -- O%28c4ccccc4OCCNCC%28O%29COc3cccc2c3c1c%28cccc1%29n2%29C could not be loaded.