InChI=1/C18H18O4/c1-10-7-12(3)14(8-11(10)2)5-6-15(19)17-16(20)9-13(4)22-18(17)21/h5-9,20H,1-4H3/p-1/b6-5+/fC18H17O4/h20h/q-1 65C2B1FE35E5A2A5