InChI=1S/C21H28O4/c1-19-8-5-14(23)11-13(19)3-4-15-16(19)6-9-20(2)17(15)7-10-21(20,25)18(24)12-22/h6,11,15,17,22,25H,3-5,7-10,12H2,1-2H3/t15-,17+,19+,20+,21+/m1/s1