Patent ID: 7563896

Claim:
Compounds of formula (1): wherein R 1 is selected from the group consisting of: a hydrogen atom; an alkyloxy group; an aromatic group; a benzyloxy group; a linear or branched alkyl group with 1-10 carbon atoms; an alkenyl group with 2 to 10 carbon atoms; an alkynyl group with 3 to 10 carbon atoms; a cycloalkyl group with 3 to 6 carbon atoms; a cycloalkenyl group with 4 to 6 carbon atoms; and a bicycloalkyl with 7 to 10 carbon atoms; R 2 is selected from the group consisting of: an alkyloxy group; an aromatic group; a benzyloxy group; a linear or branched alkyl group with 1-10 carbon atoms; an alkenyl group with 2 to 10 carbon atoms; an alkynyl group with 3 to 10 carbon atoms; a cycloalkyl group with 3 to 6 carbon atoms; a cycloalkenyl group with 4 to 6 carbon atoms; and a bicycloalkyl with 7 to 10 carbon atoms; R 3 , R 4 , and R 7 are selected from the group consisting of a hydrogen atom or an alkyl group with C 1-10 chain; and R 5 , R 6 are hydrogen atoms.