| http://www.w3.org/ns/prov#value | - A preferred group of the compounds according to the invention of general formula (I) comprises compounds wherein R is hydrogen atom, R1 stands for methyl or cinnamyl group, X is oxygen or sulphur atom or a group of formula NCH3, W is methylene group and Y stands for a group of formula NR3, wherein R3 is a benzyl or a substituted benzyl group.
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