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PROCESS FOR PREPARING NOVEL N2 DOWNWARDS AND N3 DOWNWARDS SUBSTITUTED DERIVATIVES OF THE ESTER OF 3H-2-IMINO-4-OXO-7-METHYLPYRIDO/3,2-E/-1,3-THIAZIN-5-CARBOXYLIC ACID
PROCESS FOR PREPARING NOVEL N2 DOWNWARDS AND N3 DOWNWARDS SUBSTITUTED DERIVATIVES OF THE ESTER OF 3H-2-IMINO-4-OXO-7-METHYLPYRIDO/3,2-E/-1,3-THIAZIN-5-CARBOXYLIC ACID