InChI=1S/C15H17NO5/c1-4-15(20)6-9(16)11(13(15)18)8(3)12-10(17)5-7(2)21-14(12)19/h4-5,8,17,20H,1,6,16H2,2-3H3/t8-,15+/m1/s1