ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DNC%3DC1%5BC%40%40H%5D2CCCN2C/file?format=sdf&get3d=True  -- C1%3DCC%3DNC%3DC1%5BC%40%40H%5D2CCCN2C could not be loaded.