Fuente: WIPO "olive oil" The present invention relates to a process for treating keratin materials, notably the skin and/or the lips and/or the eyelashes and/or the eyebrows, comprising the application to said keratin materials, notably the skin and/or the lips and/or the eyelashes and/or the eyebrows, in one or more successive steps, of at least i) one or more compounds of formula (I), and also the optical or geometrical isomers thereof and/or the solvates thereof, such as hydrates, or a composition containing same in which formula (I) Z, AK1, AK2, Y, R4, Ra, Rb, p, m, n, t, q and u are as defined in the description, ii) at least one crosslinking agent.