ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC1%28C%28%3DO%29N%28C%28%3DO%29N%28C1%3DO%29COC%29COC%29C2%3DCC%3DCC%3DC2/file?format=sdf&get3d=True -- CCC1%28C%28%3DO%29N%28C%28%3DO%29N%28C1%3DO%29COC%29COC%29C2%3DCC%3DCC%3DC2 could not be loaded.