The present invention relates to the free acid sacubitril formulas 1 of solid form, especially crystal forms, are included. For removing chemical impurity sacubitril free acids from crude oil, that is, be characterized in that crystallizing the salt of sacubitril using well, the amine with formula 9, R1, R2, R3 independently are hydrogen or C1-C7 alkyl, the preferably salt and cyclohexylamine, tert-butylamine or isopropylamine in formula. The invention additionally relates to novel, the sylvite sacubitril of (8)-half solvents of sacubitril of crystal form is included. It directly and efficiently and industrially can be used as preparing the sacubitril free acids and its pharmaceutically useful salt of solid form, especially the sylvite sacubitril formulas 8 of the calcium salt of the sacubitril of crystallization formula 5, formula 6 and half solvent.
