InChI=1S/C16H21NO6/c1-10(18)23-16(2)7-13(19)21-9-11-3-5-17-6-4-12(15(11)17)22-14(20)8-16/h3,12,15H,4-9H2,1-2H3/t12-,15+,16+/m1/s1