Patent ID: 8729035

Claim:
Compound with a formula: or a salt thereof, in which: R 1 ═OH or NH 2 ; R 2 , R 3 , R 4 , and R 5 , being identical or different, are H, an alkyl or haloalkyl group containing between 5 and 17 carbon atoms in a linear or branched chain, or an alkaryl group, wherein the aryl portion of the alkaryl group is naphthyl; and if R 5 ═H, and if R 2 ═R 3 ═R 4 , then R 2 , R 3 and R 4 ≠H; if R 2 ═H, then R 3 ≠H and R 4 ≠H; if R 3 ═H, then R 2 ≠H and R 4 ≠H; if R 4 ═H, then R 2 ≠H and R 3 ≠H; if R 5 ≠H then R 2 or R 3 or R 4 ═H, and if R 2 ═H, then R 3 ≠H and R 4 ≠H; if R 3 ═H, then R 2 ≠H and R 4 ≠H; if R 4 ═H, then R 2 ≠H and R 3 ≠H.