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Spectral line surveys reveal rich molecular reservoirs in G331.512-0.103, acompact radio source in the center of an energetic molecular outflow. In thisfirst work, we analyse the physical conditions of the source by means ofCH$_3$OH and CH$_3$CN. The observations were performed with the APEX telescope.Six different system configurations were defined to cover most of the bandwithin (292-356) GHz; as a consequence we detected a forest of lines towardsthe central core. A total of 70 lines of $A/E$-CH$_3$OH and $A/E$-CH$_3$CN wereanalysed, including torsionally excited transitions of CH$_3$OH ($\nu_t$=1). Ina search for all the isotopologues, we identified transitions of$^{13}$CH$_3$OH. The physical conditions were derived considering collisionaland radiative processes. We found common temperatures for each $A$ and $E$symmetry of CH$_3$OH and CH$_3$CN; the derived column densities indicate an$A/E$ equilibrated ratio for both tracers. The results reveal that CH$_3$CN andCH$_3$OH trace a hot and cold component with $T_k \sim$ 141 K and $T_k \sim$ 74K, respectively. In agreement with previous ALMA observations, the models showthat the emission region is compact ($\lesssim$ 5.5 arcsec) with gas density$n$(H$_2$)=(0.7-1) $\times$ 10$^7$ cm$^{-3}$. The CH$_3$OH/CH$_3$CN abundanceratio and the evidences for pre-biotic and complex organic molecules suggest arich and active chemistry towards G331.512-0.103.

G331.512-0.103: An Interstellar Laboratory for Molecular Synthesis I. The Ortho-to-para Ratios for CH$_3$OH and CH$_3$CN