InChI=1S/C20H20ClNO6/c1-5-22-11(4)14(20(27)28-10(2)3)15(12-8-6-7-9-13(12)21)16(18(23)24)17(22)19(25)26/h6-10H,5H2,1-4H3,(H-,23,24,25,26)/p+1