| http://www.w3.org/ns/prov#value | - A compound of the formula ##STR7## wherein R1 is a hydrogen atom, hydroxy or alkyl; R2 is ##STR8## R3 is a hydrogen atom, alkyl or hydroxyalkyl; R4 is a hydrogen atom, alkyl or phenyl; R5 is an oxygen atom, two hydrogen atoms, or a hydrogen atom and one of alkyl, phenyl, halogen atoms, or hydroxy; R6 and R7, which can be alike or different, each are a hydrogen atom, a halogen atom, hydroxy, amino,
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