{TAIL ~ The present invention} relates to {HEAD ~ the preparation} of pyridinone carboxylic acid aldehydes such as 5 methoxy 6 4 oxo 1 1,4 dihydropyridine 3 carboxylic acid 
{ TAIL ~ The present invention } relates to { HEAD ~ the preparation } of pyridinone carboxylic acid aldehydes such as 5 methoxy 6 4 oxo 1 1,4 dihydropyridine 3 carboxylic acid
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