InChI=1S/C14H20O2/c1-2-3-4-5-6-8-12-9-7-10-14(16)13(12)11-15/h4-8,10,12-13,15H,2-3,9,11H2,1H3/b5-4+,8-6+/t12-,13+/m1/s1