Spectral lines of Gauche-gauche′ normal-propanol detected in the ReMoCA survey toward Sgr B2(N2b). The best-fit LTE synthetic spectrum of Gǵ-n-C₃H₇OH is displayed in red and overlaid on the observed spectrum of Sgr B2(N2b) shown in black. The blue synthetic spectrum contains the contributions of all molecules identified in our survey so far, including propanol. The dotted line indicates the 3σ noise level. The green stars mark the lines listed as detected in Table 3.