ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1%28c2c%28c%28N%29ncn2%29nc1%29C%5BC%40%40H%5D%28OCP%28%3DO%29%28O%29O%29C/file?format=sdf&get3d=True  -- n1%28c2c%28c%28N%29ncn2%29nc1%29C%5BC%40%40H%5D%28OCP%28%3DO%29%28O%29O%29C could not be loaded.