InChI=1S/C16H20O5/c1-7-4-10(18)12-8(2)15(20)21-14(12)16(3)9(6-17)5-11(19)13(7)16/h5,8,10,12,14,17-18H,4,6H2,1-3H3/t8-,10-,12-,14+,16+/m1/s1