ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DNN%3DC%28c2ccc%28N%29cc2%29c3cc4OCOc4cc3C1/file?format=sdf&get3d=True  -- CC1%3DNN%3DC%28c2ccc%28N%29cc2%29c3cc4OCOc4cc3C1 could not be loaded.