120853-14-7 2,17,28-Trioxa-13,26-diazatricyclo(14.7.4.16,9)octacosane-14,25-dione, 18-(6-(acetyloxy)-3,5-dimethyl-4-heptenyl)-6-hydroxy-8,15,23-trimethyl-3-(2-oxo-3-pentenyl)- Bistratene B