Detection of circumstellar CH2CHCN, CH2CN, CH3CCH, and H2CS M. Agúndez, J. P. Fonfría, J. Cernicharo, J. R. Pardo and M. Guélin A&A, 479 2 (2008) 493-501 Published online: 02 January 2008 DOI: 10.1051/0004-6361:20078956