Synthetic LTE spectrum of CH₃CSNH₂ (in red). The A-symmetry state transitions are presented in the first column in panels a–e and the E-symmetry state transitions are presented in the second column in panels f–j. The spectrum was generated from the physical conditions and observing parameters described in Sect. 3.2 (that is, T_ex = 5.8, source size of 20′′, N_T ~ 2.2 × 10¹³ cm⁻²) overlaid onthe GBT spectrum of Sgr B2(LMH) shown in black. Transition quantum numbers and upper state energy levels (Table 7) are at the bottom of each spectrum. No significant emission from CH₃CSNH₂ transitions are detected beyond the 3σ upper limit.