ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28c1nnn%28c1%29Cc2c%28F%29cccc2F%29N/file?format=sdf&get3d=True  -- O%3DC%28c1nnn%28c1%29Cc2c%28F%29cccc2F%29N could not be loaded.