InChI=1S/C18H19NO3/c1-12-5-2-3-6-14(12)16-7-4-10-19(16)18(22)15-9-8-13(20)11-17(15)21/h2-3,5-6,8-9,11,16,20-21H,4,7,10H2,1H3/t16-/m1/s1