InChI=1/C10H5NO3/c12-5-7-3-8-9-6(1-2-13-9)4-11-10(8)14-7/h1-5 difuro[2,3-b:2',3'-d]pyridine-7-carbaldehyde difuro[2,3-b:2',3'-d]pyridine-7-carboxaldehyde