ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CO%5BSi%5D2%28OCCN1CCO2%29C3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True  -- C1CO%5BSi%5D2%28OCCN1CCO2%29C3%3DCC%3DCC%3DC3 could not be loaded.