6-(tert-Butyl) 3-ethyl 4-hydroxy-2-oxo-1,5,7,8-tetrahydro-1,6-naphthyridine-3,6(2H)-dicarboxylate 1g

6-(tert-Butyl) 3-ethyl 4-hydroxy-2-oxo-1,5,7,8-tetrahydro-1,6-naphthyridine-3,6(2H)-dicarboxylate 1g