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Complete one-loop QCD corrections to the process qqg\gamma->0 are presented, specifically focusing on longitudinal polarization of protons, using the SANC framework. The helicity amplitudes for three channels have been derived: quark-antiquark annihilation, gluon Compton scattering, photon Compton scattering. Furthermore, a numerical estimation of polarized observables, including cross sections and both single and double asymmetries, has been obtained using the Monte Carlo generator ReneSANCe.