2-Mercaptobenzothiazole
(2S,5R,6S)-3,3-Dimethyl-4,7-dioxo-6-(2-oxo-propyl)-6-phenylsulfanyl-4λ4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester
(2S,5R)-3,3-Dimethyl-4,7-dioxo-6-[2-oxo-prop-(Z)-ylidene]-4λ4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester
methylene (6Z)-6-acetonylidenepenicillanate pivalate
thiophenol
2,2-Dimethyl-propionic acid 2-[(2R,3S)-2-acetylsulfanyl-4-oxo-3-(2-oxo-propyl)-3-phenylsulfanyl-azetidin-1-yl]-2-(triphenyl-λ5-phosphanylidene)-acetoxymethyl ester
2,2-Dimethyl-propionic acid 2-[(2R,3S)-2-acetylsulfanyl-4-oxo-3-(2-oxo-propyl)-3-phenylsulfanyl-azetidin-1-yl]-2-hydroxy-acetoxymethyl ester
2,2-Dimethyl-propionic acid 2-[(2R,3S)-2-acetylsulfanyl-4-oxo-3-(2-oxo-propyl)-3-phenylsulfanyl-azetidin-1-yl]-2-chloro-acetoxymethyl ester
2-[(2R,3S)-2-Acetylsulfanyl-4-oxo-3-(2-oxo-propyl)-3-phenylsulfanyl-azetidin-1-yl]-3-methyl-but-2-enoic acid 2,2-dimethyl-propionyloxymethyl ester
2,2-Dimethyl-propionic acid 2-[(2R,3S)-2-acetylsulfanyl-4-oxo-3-(2-oxo-propyl)-3-phenylsulfanyl-azetidin-1-yl]-2-oxo-acetoxymethyl ester