ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCOC%28%3DO%29C%28C1CCCCN1%29c2ccc3ccccc3c2/file?format=sdf&get3d=True  -- CCOC%28%3DO%29C%28C1CCCCN1%29c2ccc3ccccc3c2 could not be loaded.