ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCN%28Cc1ccc%28cc1%29OC%29c2nccs2/file?format=sdf&get3d=True -- CN%28C%29CCN%28Cc1ccc%28cc1%29OC%29c2nccs2 could not be loaded.