SYNTHETECH &lt;NZYM> ENDS SOUTHWEST PHOTO TALKS
  Synthetech Inc said it
  discontinued negotiations on acquiring Southwest Photo chem Inc
  of Pomona, Calif.
      The company cited "irreconcilable differences" in the
  financial structure of the deal.
      It said Southwest Photo proposed a significant change in
  terms outlined in the letter of intent signed last month.
  

