| http://www.w3.org/ns/prov#value | - re a whole number from 1 to 12, preferably 1 to 5, in particular 1 to 3; and Y is OR1 or NR2R3, wherein R1, R2 and R3 independently of one another, are hydrogen or lower alkyl, or R2 and R3 combined together with the linking nitrogen signify morpholino, piperidino, pyrrolidino or piperazino;
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