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Isocyanic acid (HNCO) is a simple molecule with a potential to form prebioticand complex organic species. Using a spectral survey collected with the AtacamaPathfinder EXperiment (APEX), in this work we report the detection of 42transitions of HNCO in the hot molecular core/outflow G331.512-0.103 (hereafterG331). The spectral lines were observed in the frequency interval $\sim$ 160 -355 GHz. By means of Local Thermodynamic Equilibrium (LTE) analyses, applyingthe rotational diagram method, we studied the excitation conditions of HNCO.The excitation temperature and column density are estimated to be $T_{ex}$ =58.8 $\pm$ 2.7 K and $N$ = (3.7 $\pm$ 0.5) $\times$ 10$^{15}$ cm$^{-2}$,considering beam dilution effects. The derived relative abundance is between(3.8 $\pm$ 0.5) $\times $10$^{-9}$ and (1.4 $\pm$ 0.2) $\times $10$^{-8}$. Incomparison with other hot molecular cores, our column densities and abundancesare in agreement. An update of the internal partition functions of the fourCHNO isomers: HNCO; cyanic acid, HOCN; fulminic acid, HCNO; and isofulminicacid, HONC is provided. We also used the astrochemical code Nautilus to modeland discuss HNCO abundances. The simulations could reproduce the abundanceswith a simple zero-dimensional model at a temperature of 60 K and for achemical age of $\sim$ 10$^5$ years, which is larger than the estimateddynamical age for G331. This result could suggest the need for a more robustmodel and even the revision of chemical reactions associated with HNCO.

Isocyanic acid (HNCO) in the Hot Molecular Core G331.512-0.103: Observations and Chemical Modelling