| http://www.w3.org/ns/prov#value | - The invention relates most particularly to those compounds of the formula I, wherein R1 is a group of the formula IIb, in which X5 is methyl, X6 is a common bond with methine group of the formula I, X7 is a group of the formula --CH???C(OCH3)--CH???CH--X10, X8 together with X10 are a bond, Y is a nitrogen atom, X9 is p-chlorobenzoyl, R2 is hydrogen and R3, R4 and R5 are hydroxy-lower alkyl contain
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