Abstract: Disclosed are compounds of the formula: R represents hydrogen or is a C-3 to C-6 cycloalkyl or C-4 to C-10 straight or branched carbon chain alkyl-cycloalkyl or a group —B—D, where B is C-2 to C-10 straight or branched carbon chain alkyl and D is hydroxy or alkyloxy or 2,3-dihydroxypropyl or 2,3-dialkyloxypropyl or 2,2-dialkyl-1,3-dioxolane-5-methyl, where alkyl is C-1 to C-10 straight or branched carbon chain; W represents CH(CH3)CH2—, C(CH3)2CH2—; Z represents hydrogen, —NHCOR2, —NHCONR2R3 or —NHSO2R2 or —NHSO2NR2R3 or —NHCOOR4 wherein R4 is alkyl of from 1 to about 6 carbon atoms, alkoxyalkyl wherein the alkyl groups may be the same or different and contain from 1 to about 6 carbon atoms, alkoxyaryl, cycloalkyl of from 3 to about 8 carbon atoms.