Fig. 7
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Representation of the relative energy of the five most stable isomers of C5H4 with respect to the cyclic structure. The energies are calculated at the DLPNO-CCSD(T)/aug-cc-pvtz level with the ωB97XD/def2-TZVPD harmonic ZPE. The isomers that have been detected in TMC-1 are covered with black boxes (Cernicharo et al. 2021d; Fuentetaja et al. 2024).
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