The suitability of 4-di (2-chloroethyl) aminoanilino-4-hydroxyphenethylaminomethanone 2 to act as a prodrug for melanocyte-directed enzyme prodrug therapy (MDEPT) is assessed. Thus its synthesis, ability to generate a cytotoxic agent upon exposure to tyrosinase, and stability within different sera are reported. A comparison is made to illustrate that the new urea prodrug 2 is a more suitable candidate for MDEPT than the corresponding ...