| abstract |
The compounds of the invention have the formula WHEREIN Y is a radical of the formula WHEREIN N IS 1, 2, 3, 4, 5, OR 6, M IS 0 OR 1, AND R5 is hydrogen or alkyl of 1 to 3 carbons; R1, R2, R3 and R4 are the same or different and are alkanoyl of 1 to 4 carbons; haloalkanoyl of 1 to 4 carbons; or alkoxycarbonyl of the formula O PARALLEL -COR wherein R is an alkyl radical of 1 to 4 carbons; R7 and R8 are the same or different and are hydrogen or alkyl having 1 to 4 carbon atoms; and R9 is hydrogen or a straight or branched chain alkyl radical having 1 to 6 carbon atoms. |