| http://www.w3.org/ns/prov#value | - cycloalkyl, unsubstituted or substituted phenyl, benzyl or hetaryl, acyl, alkoxycarbonylalkyl and silyl, R2 and R3 are in particular hydrogen and R6 is inter alia hydrogen, formyl, unsubstituted or substituted alkyl, alkenyl, alkynyl, cycloalkyl or unsubstituted or substituted aryl.
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