Total Syntheses of Depsipeptide Elastase Inhibitors YM-47141 and YM-47142 with use of Ylide Protection and Coupling Methods WassermanHarry H. ChenJyun-Hung XiaMingde 1999 Total Syntheses of Depsipeptide Elastase Inhibitors YM-47141 and YM-47142 with use of Ylide Protection and Coupling Methods