FIELD: organic chemistry, vitamins. SUBSTANCE: invention relates to compounds of the formula (I) 
wherein R1 and R2 can be similar or different and represent (C1-C4)-alkyl; R3 represents hydrogen, halogen atom, (C1-C4)-alkyl or O-(C1-C4)-alkyl, and to their in vivo hydrolyzed esters of pharmaceutically acceptable acids. Compounds induce differentiation and inhibit undesirable proliferation of some cells and can be used in medicine and veterinary practice. EFFECT: valuable medicinal properties of compounds. 16 cl, 3 tbl, 18 ex
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