InChI=1S/C19H18ClNO4/c1-19(24,9-20)15-7-11-14(25-15)8-13(22)16-17(11)21(2)12-6-4-3-5-10(12)18(16)23/h3-6,8,15,22,24H,7,9H2,1-2H3