{TAIL ~ A method} of removing SO2 from a gas stream containing the same by absorbing the SO2 in an aqueous solution containing a 4 2 piperazinone compound or an alkyl or aryl substituted {HEAD ~ derivative} thereof 
{ TAIL ~ A method } of removing SO2 from a gas stream containing the same by absorbing the SO2 in an aqueous solution containing a 4 2 piperazinone compound or an alkyl or aryl substituted { HEAD ~ derivative } thereof
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