Notes. Updated Table from Martín (2009). For references on the first detection of each species see (Martín et al. 2006) and the reported detections of: HD and LiH in absorption at high redshift (Combes & Wiklind 1998; Varshalovich et al. 2001); in absorption towards the ULIRG IRAS 08572+3915 (Geballe et al. 2006); H₃O ⁺  in emission towards the starburst M 82 and the ULIRG Arp 220 (van der Tak et al. 2008); CH and NH in absorption towards Arp 220 (González-Alfonso et al. 2004); the tentative DNC, N₂D⁺, C³³S, and ¹³CH₃OH towards NGC 253 and the Large Magellanic Cloud (Martín et al. 2006; Wang et al. 2009; Martín et al. 2009b); H₂O ⁺  in emission towards Mrk 231 and in absorption towards M 82 (van der Werf et al. 2010; Weiß et al. 2010); OH⁺ and HF in emission towards Mrk 231 (van der Werf et al. 2010); and the ¹³C isotopologues of HC₃N, HO, ²⁹SiO, and CH₂CO being reported in this work.