InChI=1S/C21H22O5/c1-11(2)4-5-14-16(23)7-6-13-15-10-25-18-9-12(22)8-17(24-3)19(18)21(15)26-20(13)14/h4,6-9,15,21-23H,5,10H2,1-3H3/t15-,21+/m0/s1