Two previous Phase 1 studies allowed exploring the PK of LAS41008 30 mg and 120 mg separately after multiple dosing. In the current study, an improved bioanalytical method will allow the detection of lower MMF concentrations, and thus the same gastro-resistant tablet formulation (LAS41008) as used in the previous Phase 1 study will be investigated, but on a larger population and after single oral dose administration. Only the higher LAS41008 dose (120 mg) will be tested, as this is the formulation to be most frequently used during a standard treatment course for psoriasis with LAS41008. Similarly, single oral doses of Fumaderm® 120 mg (defined mixture of DMF and calcium (Ca), magnesium (Mg), and zinc (Zn) salts of ethylhydrogenfumarate (EHF, mono-ethyl fumarate (MEF)) will be tested in order to provide better comparative PK data. The comparison of LAS41008 and Fumaderm® PK will be evaluated in an exploratory manner.