tokens: We thank Dr. O. Pirali and S. Gruet for helpful discussions and advices in the far-infrared analysis using the Loomis-Wood program. I.K. and A.J. are indebted to Dr. V.V. Ilyushin for helpful discussions and careful reading of the manuscript. A.J. and I.K. thank the Groupe de Recherche International GDRI HighRes (especially Dr. A. Perrin) and the Programme Chimie Milieu Interstellaire PCMI for travel funding. V. V. thanks the Fonds der Chemischen Industrie (FCI) for a Ph.D. fellowship.
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