InChI=1S/C20H27NO4S/c1-14(4-5-15-6-9-17(25-2)10-7-15)21-13-19(23)16-8-11-18(22)20(12-16)26(3)24/h6-12,14,19,21-23H,4-5,13H2,1-3H3