Transaction log used 200GB unable to shrink

Hi All,

Currently I am facing diskspace(0 KB available) issue in one of my application server..

When I checked SQL server SMS_UDB (is our DB name) containing 70GB but SMS_UDB_LOG (Transaction log) Containing more than 200GB. When I checked the diskspace report 200GB space used (showing Green). I am unable to shrink the file. I am running 2008 SQL with simple recovery model. I taken bak to other server.   It's urgent Kindly help me to reduce the transaction log

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thanks