ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DC%28C%28%3DC%28C2%3DC1OCO2%29OC%29OC%29CC%3DC/file?format=sdf&get3d=True  -- COC1%3DC%28C%28%3DC%28C2%3DC1OCO2%29OC%29OC%29CC%3DC could not be loaded.