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Using radio observations with the Green Bank Telescope, evidence has now beenfound for a second five-membered ring in the dense cloud Taurus MolecularCloud-1 (TMC-1). Based on additional observations of an ongoing, large-scale,high-sensitivity spectral line survey (GOTHAM) at centimeter wavelengths towardthis source, we have used a combination of spectral stacking, Markov chainMonte Carlo (MCMC), and matched filtering techniques to detect2-cyanocyclopentadiene, a low-lying isomer of 1-cyanocyclopentadiene, which wasrecently discovered there by the same methods. The new observational data alsoyields a considerably improved detection significance for the more stableisomer and evidence for several individual transitions between 23 - 32 GHz.Through our MCMC analysis, we derive total column densities of$8.3\times10^{11}$ and $1.9\times10^{11}$ cm$^{-2}$ for 1- and2-cyanocyclopentadiene respectively, corresponding to a ratio of 4.4(6)favoring the former. The derived abundance ratios point towards a commonformation pathway - most likely being cyanation of cyclopentadiene by analogyto benzonitrile.

Interstellar Detection of 2-Cyanocyclopentadiene, C$_5$H$_5$CN, a Second Five-Membered Ring Toward TMC-1