ABSOLUTE STRUCTURES OF ZALUZANINE-A AND ZALUZANINE-B

2D NMR, H-1 and C-13 as well as single crystal X-ray studies were perf ormed in order to establish the correct configuration of all assymetri cal centers in the zaluzanines A and B. This work enabled us to correc t the previously proposed absolute configuration at the C-5 and C-6 ce nters, obtained by chemical correlations. Crystals of zaluzanin B (Ic) are orthorhombic with a = 6.8176(6), b = 12.870(2), and c = 18.507(5) Angstrom, space group P2(1)2(1)2(1) and the crystals of the carbodibr omo derivative of zaluzanin A diacetate (4) are also orthorhombic with a = 14.6123(5), b = 15.1218(4), and c = 19.9384(4) Angstrom, space gr oup P2(1)2(1)2.