FIELD: chemistry.
SUBSTANCE: invention relates to a compound of formula (I), wherein: - R1 is H or OH, - R2 is (C1-C6)alkyl, COOH, COOMe or a thiazolyl group, - R3 is H or (C1-C6)alkyl group, and - R4 is phenyl-(C1-C8)alkyl group substituted with one or more groups selected from groups OH and NR9R10, or to a pharmaceutically acceptable salt thereof, pharmaceutical compositions containing same, and methods for preparation thereof. 
(I)
EFFECT: compounds can be used to treat cancer or benign proliferative disorders.
12 cl, 64 ex
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