R3 and R5 are identical or different and {HEAD ~ each} represents {TAIL ~ hydrogen}, a straight chain, branched or cyclic alkyl radical having up to 6 carbon atoms, a phenyl or benzyl radical, or one of the substituents R3 or R5 represents an alkyl radical which has up to 6 carbon atoms and is substituted by acetoxy or benzoyloxy, alkoxy or dialkoxy, each having up to 3 carbon atoms in each alkyl group, hydroxyl, amino or aminoalkoxy having up to 6 carbon atoms, or represents the formyl or nitrile group, 
represents
R3 and R5 are identical or different and { HEAD ~ each } represents { TAIL ~ hydrogen } , a straight chain , branched or cyclic alkyl radical having up to 6 carbon atoms , a phenyl or benzyl radical , or one of the substituents R3 or R5 represents an alkyl radical which has up to 6 carbon atoms and is substituted by acetoxy or benzoyloxy , alkoxy or dialkoxy , each having up to 3 carbon atoms in each alkyl group , hydroxyl , amino or aminoalkoxy having up to 6 carbon atoms , or represents the formyl or nitrile group ,
OTH OTH OTH OTH OTH OTH OTH OTH 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 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