InChI=1S/C16H17NO3/c18-11-3-1-8-7-10-9-2-4-12(19)15-16(9,5-6-17-10)13(8)14(11)20-15/h1,3,9-10,15,17-18H,2,4-7H2/t9-,10+,15-,16-/m0/s1