DEALTALK-As hunt for Allergan drags on, some Valeant owners have doubts

NEW YORK/BOSTON, Aug 20 (Reuters) - A few months ago, an innovative partnership between Valeant Pharmaceuticals and billionaire investor William Ackman to buy Botox maker Allergan Inc looked like a blueprint for success. Now some Valeant shareholders who backed the deal at its start are questioning whether it will become reality.