BUZZ-Valeant Pharmaceuticals: Touches near 6 year-low
** Embattled Canadian drugmaker's U.S.-listed shares fall as much as 10.6 pct to touch near 6-year low of $23.55
** William Doyle, a key figure in Pershing Square Capital Management's controversial investment in Valeant, is leaving the hedge fund, its founder, William Ackman, told investors on Wednesday
** Valeant's Toronto-listed stock is down 6.9 pct at C$31.47
** Up to Wednesday's close, Valeant's U.S shares had fallen 74 pct this year
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