  We define admissible quasi-Hopf quantized universal enveloping (QHQUE)
algebras by h-adic valuation conditions. We show that any QHQUE algebra is
twist-equivalent to an admissible one. We prove a related statement: any
associator is twist-equivalent to a Lie associator. We attach a quantized
formal series algebra to each admissible QHQUE algebra and study the resulting
Poisson algebras.
