Sun PharmaBSE 0.38 % has asked 18 top executives of Ranbaxy Labs to leave the firm in one of the biggest culls of senior management professionals in recent times. The order comes a year after the Dilip Shanghvi-led firm acquired Ranbaxy in an all-stock deal and a few weeks after Q4 profits shrank 44 per cent due to costs incurred in assimilating the buyout and regulatory issues. 

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