| http://www.w3.org/ns/prov#value | - An isomerization method wherein a compound of formula ##STR1## wherein X and y together form a 3-oxo radical, or X is a hydrogen atom and Y is either a radical a ##STR2## where R2 is OH or O-acyl, or an O-alkyl or NH2 radical; R1 is a hydrogen atom or a methyl radical; Z is hydrogen or an acyl radical; and R is a hydrogen atom, an NH2 radical or a (CH2)n Ar, NH(CH2)n Ar or N???CH(CH2)n Ar radical,
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