FIELD: organic chemistry. SUBSTANCE: invention relates to crystal of N-[N-[3-(3-hydroxy-4-methoxyphenyl)propyl] -L-α-aspartyl-L-phenylalanine 1-methyl ester that shows roentgen rays diffraction peaks at least at diffraction angles taken among group including: a) 8,2°, 14,7°, 20,5°, 22,4°; b) 4,8°, 7,3°, 9,9°, 20,0°; c) 4,7°, 8,0°, 9,0° 14,0°, 20,2° 24,3° (2θ, α-rays from CuK) in determination by powder roentgenography method. Invention provides crystallization sweetening agent, its enhanced stability and purity. EFFECT: improved preparing method. 4 cl, 1 tbl, 4 dwg, 11 ex
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