Use as a Cosmetic Agent, Moisturizing the skin, a compound of formula (i): (i) in which R1 and R2 are independently of one another, a hydrogen Atom, an alkyl group or linealsaturado of C1 - C6 and C2 - C6 unsaturated or saturated or branched alkyl group unsaturated d C3 - and c6opcionalmente substituted with one or More groups, which can be identical or different.From OR5 sime3 -, -, - and - F co2r6 or (ii) R1 and R2 can form, together with the nitrogen Atom which carries a 5 to 7 saturadocon heterocycle Ring members and optionally includes another heteroatom selected from Sulphur Heterocycles (being chosen in this yox\u00edgeno Including pyrrolidine, piperidine, morpholine,Tiomorfolina yciclohexametilenimina (or homopiperidina), and being so preferable), being esteheterociclo pyrrolidone optionally replaced with 1 to 3 (1 Way preferable linear alkyl group (S) (IS) (C1 - C4) or branched (S) (C3 - C4), optionally substituted (S) with one or most groups Oh R5 represents a hydrogen Atom,Or a saturated alkyl group (C1 - C3) linear or branched alkyl group C3, or unsaturated (c2-c3) R6 represents a hydrogen Atom or a group of linear saturated alkyl (c1-c4) or branched (C3 - C4) R3 represents Hydrogen Atom or a saturated linear alkyl group (C1 - C6), or OR3 represents a phosphate, it is possible that the two groups R3 form, in Common,A group of isopropylidene R4 represents a hydrogen Atom or or4 - represents a phosphate Group and Salts and solvates thereof.Uso cosmético, como un agente hidratante de la piel, de un compuesto de fórmula (I) :en la que - (i) R1 y R2 representan, independientemente uno de otro, un átomo de hidrógeno, o un grupo alquilo linealsaturado de C1-C6 o insaturado de C2-C6 o un grupo alquilo ramificado saturado o insaturado de C3-C6opcionalmente sustituido con uno o más grupos, que pueden ser idénticos o diferentes, escogidos entre -OR5, -SiMe3, -CO2R6 y -F o (ii) R1 y R2 pueden formar, conjuntamente con el átomo de nitrógeno que los lleva, un heteroci
