InChI=1/C20H17NO5S/c1-12(2)15-8-3-4-9-18(15)27-19-16(22)11-17(26-20(19)23)13-6-5-7-14(10-13)21(24)25/h3-12,22H,1-2H3/p-1/fC20H16NO5S/h22h/q-1 C4FFA43B2C344CEA