The quest for complex molecules in space: laboratory spectroscopy of n-butyl cyanide, n-C4H9CN, in the millimeter wave region and its astronomical search in Sagittarius B2(N)
M. H. Ordu, H. S. P. Müller, A. Walters, M. Nuñez, F. Lewen, A. Belloche, K. M. Menten and S. Schlemmer
