InChI=1S/C16H18ClNO4S/c1-22-16(21)15(11-4-2-3-5-12(11)17)18-7-6-13(23)10(9-18)8-14(19)20/h2-5,15,23H,6-9H2,1H3,(H,19,20)/t15-/m0/s1