Reduction of 7-aryl-6,8-dioxo-2-oxa-3,7-diazabicyclo[3.3.0]oct-3-ene-4-carboxylic and 7-aryl-6,8-dioxo-1-oxa-2,7-diazaspiro[4.4]non-2-ene-3-carboxylic acid esters

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