ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCOCc1nc2c%28N%29nc3ccccc3c2n1CC%28C%29%28C%29O/file?format=sdf&get3d=True  -- CCOCc1nc2c%28N%29nc3ccccc3c2n1CC%28C%29%28C%29O could not be loaded.