4-methoxy-2-oxo-6-[(1E,7E,9E)-undeca-1,7,9-trienyl]pyran-3-carbaldehyde 4-methoxy-2-oxo-6-[(1E,7E,9E)-undeca-1,7,9-trienyl]-3-pyrancarboxaldehyde 2-keto-4-methoxy-6-[(1E,7E,9E)-undeca-1,7,9-trienyl]pyran-3-carbaldehyde