Compound 1 . Compound 1 was dissolved in a concentrated solution of ~95:5 methanol:water with heat and crystalized at RT via slow evaporation. The structure (tt2101) was re-determined at low temperature to obtain more accurate exocyclic torsion angles involving the hydroxyl hydrogens. The re-determined structure was essentially identical to those reported previously. The presence of C labeling did not alter the crystal structure in any appreciable fashion. Hydroxyl hydrogen atoms were located from a difference Fourier map and refined freely.