ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OCC1%28CCCC1%29COC%28%3DO%29Nc2ccccc2%29Nc3ccccc3/file?format=sdf&get3d=True  -- O%3DC%28OCC1%28CCCC1%29COC%28%3DO%29Nc2ccccc2%29Nc3ccccc3 could not be loaded.