{HEAD ~ A compound} of {TAIL ~ formula} I ##STR5## wherein: R represents phenyl optionally substituted by a substituent selected from the group consisting of hydroxy, chlorine, bromine, fluorine, methoxy, ethoxy, ethyl, methyl, isopropyl, isobutyl, isopropoxy, isobutoxy, amino, nitro, phenyl, mercapto, methylthio, methylsulfinyl and methylsulfonyl 
of
{ HEAD ~ A compound } of { TAIL ~ formula } I # # STR5 # # wherein : R represents phenyl optionally substituted by a substituent selected from the group consisting of hydroxy , chlorine , bromine , fluorine , methoxy , ethoxy , ethyl , methyl , isopropyl , isobutyl , isopropoxy , isobutoxy , amino , nitro , phenyl , mercapto , methylthio , methylsulfinyl and methylsulfonyl
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH