Recently we studied L-alanine to 9.85 GPa. This is the highest pressure for which structural data are available for any organic system larger than methane. The results enabled us to disprove claims made for a phase transition at 2 GPa. Neither was a previously proposed phase transition at 9 GPa observed, though this may be a deuteration effect. At 9.85 GPa the cell volume is 75% of its ambient-pressure value; the NH¿O H-bonds are amongst the shortest yet observed. The powder pattern remains sharp, however, and we now propose to explore the behaviour of alanine at still higher pressure. This will be the first study on a complex H-bonded organic solid beyond 10 GPa, and the results will be fascinating in revealing the effects on the H-bonding and phase behaviour of a complex molecular syetem.