InChI=1/C20H21N3O4S/c1-13(2)20-19-17(16-5-3-4-6-18(16)21-19)11-12-22(20)28(26,27)15-9-7-14(8-10-15)23(24)25/h3-10,13,20-21H,11-12H2,1-2H3/t20-/m1/s1 15956B9147341A14