Patent ID: 6911450

Claim:
A compound having the following general Formula I: wherein n is equal to 3; R 1 represents an ethyl group or an isopropyl group; each of the R 2 groups represents independently a hydrogen atom, a C 1 -C 3 alkyl group or a halogen atom; one of the R 3 and R 4 groups represents a hydrogen atom while the other of the R 3 and R 4 groups represents an —OH or —OR 5 group, wherein R 5 may be a C 2 -C 7 acyl group, a C 1-C 6 alkylaminocarbonyl group, an ar(C 1 -C 6 )alkylaminocarbonyl group optionally substituted on the aryl, an arylcarbonyl group optionally substituted or a heteroarylaminocarbonyl group, or a pharmaceutically acceptable salt thereof.