(S)-(-)-DBD-Pro-COCl [=(S)-(-)-4-(N,N-Dimethylaminosulfonyl)-7-(2-chloroformylpyrrolidin-1-yl)-2,1,3-benzoxadiazole] [HPLC Labeling Reagent for e.e. Determination];(S)-(-)-DBD-ProCZ, (S)-(-)-1-[7-(N,N-Dimethylsulfamoyl)-4-benzofurazanyl]-2-pyrrolidinecarb