InChI=1S/C7H5N5O/c13-6-4-5(10-3-9-4)12-2-1-8-7(12)11-6/h1-3H,(H,9,10)(H,8,11,13) 3H-imidazo[2,1-b]purin-4(5H)-one O=C1Nc2nccn2c3nc[nH]c13 O=C1Nc2nccn2c3nc[nH]c13