An L2/L1 microemulsion composition comprising water, a compound of formula (I)wherein Rl is a straight orbranched alkyl group containing 8 to 16 carbon atoms at the 2- or 3- positionof the morpholino ring, and R2 is a straight or branchedalkyl group containing 2 to 10 carbon atoms, substituted with a hydroxy groupexcept in the alpha-position, and a salt of a compoundof formula (I).