methyl (4aR,8aR)-8a-but-3-enyl-4-oxo-5,6,7,8-tetrahydro-4aH-quinoline-1-carboxylate;(4aR,8aR)-8a-but-3-enyl-4-oxo-5,6,7,8-tetrahydro-4aH-quinoline-1-carboxylic acid methyl ester;(4aR,8aR)-8a-but-3-enyl-4-keto-5,6,7,8-tetrahydro-4aH-quinoline-1-carboxylic acid methyl ester
methyl (4aR,8aR)-8a-but-3-enyl-4-oxo-5,6,7,8-tetrahydro-4aH-quinoline-1-carboxylate