Tentative detection of ethylene glycol toward W51/e2 and G34.3+0.2 J. M. Lykke, C. Favre, E. A. Bergin and J. K. Jørgensen A&A, 582 (2015) A64 Published online: 08 October 2015 DOI: 10.1051/0004-6361/201526220