| http://www.w3.org/ns/prov#value | - According to a still further feature of the invention there is provided a compound of formula (I), wherein one of the groups R1, R2 and R3 is a branched (??-1)-hydroxyalkyl group having from 5 to 8 carbon atoms, in which the hydroxy group is separated from the xanthine nucleus by at least two, preferably at least 3 carbon atoms, the radicals R1 and R3 which are other than a hydroxyalkyl group are
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