ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1cc%28cc%28c1OC%29OC%29Cc2cnc%28nc2N%29N/file?format=sdf&get3d=True  -- COc1cc%28cc%28c1OC%29OC%29Cc2cnc%28nc2N%29N could not be loaded.