Synthesis of a Cyclopropene Analogue of Ceramide, a Potent Inhibitor of Dihydroceramide Desaturase This work was supported by the Dirección General de Enseñanza Superior e Investigación Científica (grant PB97-1171) and the Departament d'Universitats, Recerca i Societat de la Informació, Generalitat de Catalunya (grant 1999-SGR 00187 and a Predoctoral fellowship to G.T.). We thank Dr. J. Casas, Dr. A. Delgado, and Dr. J. Joglar for their help in different aspects of this work.