ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCn1cncc1-c1c%5BnH%5Dc2ccc%28cc12%29C%28N%29%3DO/file?format=sdf&get3d=True  -- CCn1cncc1-c1c%5BnH%5Dc2ccc%28cc12%29C%28N%29%3DO could not be loaded.