Intermediates of lisinopril dihydrate

a, n-6-trifluoro acetyl-l-lysine

(cas no.10009-20-8)

b, n 2 -[(1s)-ethoxycarbonyl-3-phenylpropyl]-n 6 -trifluoroacetyl-l-lysine

c, 1-[n 2 -[(1s)-ethoxycarbonyl-3-phenylpropyl]-n 6 -trifluoroacetyl]-l-lysyl-l-proline

solid: purity, assa y≥ 98.0%
solution: purity ≥ 90%, assay ≥ 30%