| http://www.w3.org/ns/prov#value | - Generally speaking, the compounds of formula (I) are<BR> susceptible of being obtained by a reaction comprising the following step:<BR> <BR> <BR> a) mixing together, the three aldehydes of the formulae (II), (III) and (IV), wherein R', R2, R3 and R4 have the meaning as defined in formula (I), in the presence of a base, such as an alkaline hydroxide or C, to C4 alkoxide, and a temperature comprised
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