prov:value
| - According to a particular embodiment of the compounds of formula (I), X is H, Y is O and Z is S(???O)n ; n is 0, 1 or 2; R' and R are each selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, hydroxyalkyl, aminoalkyl, C3-7 cycloalkyl, aryl, diarylmethylol, and alkyl substituted by at least one aryl group, provided that at least R' or R is other than hydrogen, and that when Z
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