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We present 92cm observations of the high-redshift galaxy B2 0902+343 (z=3.40)with the Westerbork Synthesis Radio Telescope (WSRT). Twenty-one cm HI isdetected in absorption, at a depth of 15.9 mJy (=~6\sigma) and rest framevelocity width 120 km/s. We also report a null detection of OH emission orabsorption at the 1665/1667 MHz rest-frame transitions. Based on our spectralsensitivity, we derive an upper limit on OH maser luminosity oflog(L/Lsun)<5.2. In addition, we consider the possibility of absorption, andestimate a maximum column depth N(OH) of 1x10^15 cm^-2, corresponding to atmost 2x10^5-9x10^6 Msun of OH in the galaxy. The implications of these resultsare discussed in the context of current efforts to extend the OH megamaserluminosity function and galactic merger rate to high redshift.Comment: 6 pages, 3 figures, accepted for publication in A&

Observations of the high-redshift galaxy B2 0902+343 at 92 cm