Patent ID: 7964610

Claim:
Compounds of Structure I, or salts thereof: wherein R 1 is (1) C 1 -C 10 straight-chain or branched alkylene, optionally substituted with an aromatic ring, (2) —(CH 2 ) p CH═CH(CH 2 ) p —, in which each p is independently an integer from 0 to 4, or (3) —(CH 2 )—X(CH 2 ) n —, in which each n is an integer from 0 to 2, X is O, S, NH, N(COOCH 2 Ph), having 1,2-, 1,3-, or 1,4-substitution, in which Y is O, S or NH, having 1,2-, 1,3-, or 1,4-substitution or in which m is an integer from 1 to 4; and wherein R 2 is H or C 1 -C 6 straight-chain or branched alkyl.