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BRIEF-Yifan Pharma's Unit To Buy Stake In SciGen To Bring It Private, Signs Agreement On Binding Offer With Bioton

May 15 (Reuters) - Yifan Pharmaceutical Co Ltd :

* SAYS UNIT YIFAN INTERNATIONAL PHARMACEUTICAL PLANS TO OFFER TO BUY AT LEAST 90 PERCENT STAKE IN SCIGEN AT $0.0507 PER SHARE TO EVENTUALLY BRING SCIGEN PRIVATE

* SAYS UNIT HAS SIGNED AGREEMENT ON BINDING OFFER WITH SCIGEN'S CONTROLLING SHAREHOLDER BIOTON Source text in Chinese: https://bit.ly/2ImdqFx Further company coverage: (Reporting by Hong Kong newsroom)