ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC2%28C%29CC1%3DC%28C%28%3DCC%3DC1%29OC%28NC%29%3DO%29O2/file?format=sdf&get3d=True  -- CC2%28C%29CC1%3DC%28C%28%3DCC%3DC1%29OC%28NC%29%3DO%29O2 could not be loaded.