InChI=1/C16H11NO4/c1-20-15-7-13(19)12(8-17)11-6-14(21-16(11)15)9-2-4-10(18)5-3-9/h2-7,18-19H,1H3/p-1/fC16H10NO4/h19h/q-1 E394B976769ADB4A