ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1C/C%3DC%5CCCOc2cccc%28c2%29-c3ccnc%28n3%29Nc4cccc%28c4%29C1/file?format=sdf&get3d=True  -- CN1C/C%3DC%5CCCOc2cccc%28c2%29-c3ccnc%28n3%29Nc4cccc%28c4%29C1 could not be loaded.