Relative thermodynamic stability of the [C,N,O] linkages as an indication of the most abundant structures in the ISM

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Fig. 1

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Structures of C₂H₃NO isomers as ordered in Table 1 by increasing energy. The black boxes correspond to the HNCO isomers (Table 2), the orange box corresponds to the second isomer HOCH₂CN identified recently. ^(a) Isomer whose electronic ground state is a triplet state.

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