4-OXO-4,6,7,8,9,10-HEXAHYDRO-PYRIDO[1,2-A]AZEPINE-1-CARBOXYLIC ACID METHYL ESTER ETHYL 6-HYDROXY-2-METHYLPYRIDINE-3-CARBOXYLATE 4-OXO-4,6,7,8,9,10-HEXAHYDRO-PYRIDO[1,2-A]AZEPINE-1-CARBOXYLIC ACID ETHYL ESTER AURORA KA-4355 4, 6-DIHYDROXYNICOTINIC ACID ETHYL ESTER ETHYL 2-AZEPAN-2-YLIDENACETATE