2,2,2-trichloroethyl 6α-phenylselenopenicillanate (1S)-S-oxide

2,2,2-trichloroethyl 6-chloro-6-iodopenicillanate (1S)-S-oxide

3-methyl-2-[3-oxo-4-(2-phenyl-acetylamino)-3H-isothiazol-2-yl]-but-2-enoic acid 2,2,2-trichloro-ethyl ester