** Shares of Invex Therapeutics IXC.AX fall as much as 3.1% to A$0.155, their biggest intraday pct drop since September 18

** The pharma co says that negotiations with a rare neurological disease therapeutics development firm have been discontinued

** Agreement in regards to complementary neurological treatment asset

** Talks halted due to instability and uncertainty caused after co received notice to remove two of three directors

** YTD, shares up 134.9%

(Reporting by Nichiket Sunil in Bengaluru)

((Nichiket.Sunil@thomsonreuters.com))