The present invention relates to novel crystal forms of 2 amino N [2 (3a (R) benzyl 2 methyl 3 oxo 2 3 3a 4 6 7 hexahydro pyrazolo[4 3 c]pyridin 5 yl) 1 (R) benzyloxymethyl 2 oxo ethyl] isobutyramide L tartrate. More particularly the invention relates to polymorph forms and to processes for the preparation of compositions containing and to uses of such polymorph forms.