(5xi,11beta,12beta)-11,12-dihydroxy-16-oxostachan-18-oic acid InChI=1/C20H30O5/c1-17-6-4-7-18(2,16(24)25)11(17)5-8-20-9-12(21)19(3,10-20)15(23)13(22)14(17)20/h11,13-15,22-23H,4-10H2,1-3H3,(H,24,25)/t11?,13-,14+,15-,17-,18-,19+,20+/m1/s ent-11alpha,12alpha-Dihydroxy-16-ketobeyeran-19-oic acid phenol, 4,6-dibromo-3-chloro-2-methoxy-