Model predictions for the integrated fluxes for H₂CO (both ortho and para lines, assuming an ortho/para ratio of 3), and upper limits for A-CH₃OH, H¹³CO⁺, HCO⁺ (triangles and diamonds, respectively), and CN based on our best-fit models for detections and upper limits. The boxes show the 3σ upper limit of the ALMA sensitivity for Band 6 (230 GHz), Band 7 (345 GHz), and Band 9 (690 GHz), integrated over the line profile for one hour integration in the full array. The targeted lines in observations are indicated in red (this study), blue (Öberg et al. 2010, 2011), and purple (Thi et al. 2004). The lines that have the best potential for observation compared with the ALMA sensitivity are encircled.