ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN3C1CCC3%28O%29CC%28C1%29OC%28%3DO%29c2ccccc2/file?format=sdf&get3d=True -- CN3C1CCC3%28O%29CC%28C1%29OC%28%3DO%29c2ccccc2 could not be loaded.