InChI=1S/C16H21NO4S/c18-22(19,20)21-12-5-4-11-9-15-13-3-1-2-6-16(13,7-8-17-15)14(11)10-12/h4-5,10,13,15,17H,1-3,6-9H2,(H,18,19,20)/t13-,15+,16+/m1/s1