ERROR opening https://cactus.nci.nih.gov/chemical/structure/c2ccccc2NC%28%3DO%29Oc%28ccc1%29cc1NC%28%3DO%29OCC/file?format=sdf&get3d=True -- c2ccccc2NC%28%3DO%29Oc%28ccc1%29cc1NC%28%3DO%29OCC could not be loaded.