InChI=1S/C21H34O4/c1-12(2)15-8-19(23)20(4)10-17-14(6-7-21(17,24)11-25-5)13(3)18(22)9-16(15)20/h10,12-14,18-19,22-24H,6-9,11H2,1-5H3/b17-10+/t13-,14+,18+,19+,20-,21+/m1/s1