ERROR opening https://cactus.nci.nih.gov/chemical/structure/S%3DP%28OCC%29%28OCC%29Oc1nn2cc%28c%28nc2c1%29C%29C%28%3DO%29OCC/file?format=sdf&get3d=True  -- S%3DP%28OCC%29%28OCC%29Oc1nn2cc%28c%28nc2c1%29C%29C%28%3DO%29OCC could not be loaded.