ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OC2%28c1ccccc1%29CCN%28C%29CC2%29CC/file?format=sdf&get3d=True  -- O%3DC%28OC2%28c1ccccc1%29CCN%28C%29CC2%29CC could not be loaded.