InChI=1S/C19H20O4/c1-9-8-23-18-11-7-12(20)15-10(5-4-6-19(15,2)3)14(11)17(22)16(21)13(9)18/h7,9,22H,4-6,8H2,1-3H3/t9-/m0/s1