ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCOC%28%3DO%29c1cncn1C%28C%29c2ccccc2/file?format=sdf&get3d=True  -- CCCOC%28%3DO%29c1cncn1C%28C%29c2ccccc2 could not be loaded.