** Shares of Australia's Clarity Pharmaceuticals CU6.AX rise as much as 7.1% to A$3.180, their biggest intraday pct gain since February 19

** Radiopharmaceutical co signs new agreement with University of Queensland for supply of copper-64 isotope

** CU6 among the top gainers in the benchmark ASX 200 index .AXJO

** Stock has fallen 29% YTD, as of 2340 GMT

(Reporting by Roshan Thomas in Bengaluru)

((Roshan.Thomas@thomsonreuters.com))