Abstract
Methylisocyanoacetylene (CH3C2NC), an isomer of methylcyanoacetylene (CH3C3N), has been searched for in the Taurus molecular cloud 1 (TMC-1) with the Effelsberg 100-m radiotelescope using recent laboratory data by Gripp & Guarnieri. The upper limit for CH3~NC in TMC-1 is determined to be N[CH3C2NC] ~2.4 x 1012 cm-2• This value sets a lower limit to the ratio N[CH3C3N]/N[CH3C2NC] ~ 2.1, which is, in fact, calculated to be larger at least by an order of magnitude.
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