FIELD: organic chemistry, amino acids, pharmacy. SUBSTANCE: invention relates to a pharmaceutical composition and new derivatives of L-amino acids designated for treatment and prophylaxis of liver diseases. Composition comprises an effective amount of the compound of the formula (I): 
where R is 
, H or R in common with a carbon atom to which it is bound and with R1 forms 5-membered cycle: 
; R1 is H, COCH3 or forms in common with R the indicated 5-membered cycle; X is absent or means Mg, 
or OH-HO-(CH2)2-CH2NH2 at condition that R and (CH2)2-CH2-N(CH3)2 are not H simultaneously and if X is absent then R is 
where R1 is COCH3. Derivatives of L-amino acid have the formula (I). EFFECT: broadened assortment of hepatoprotective agents. 3 cl, 2 tbl, 16 ex
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