InChI=1S/C15H21N3O4S/c19-10-11-4-6-14(7-5-11)23(21,22)17-15(20)16-18-8-12-2-1-3-13(12)9-18/h4-7,12-13,19H,1-3,8-10H2,(H2,16,17,20)/t12-,13+