(5R)-6t-amino-3,3-dimethyl-1c-[(toluene-4-sulfonyloxy)-acetyl]-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptan-7-one

6β-(2-hydroxy-1-naphthylideneamino)penicillanic acid

(5R)-6t-(2-hydroxy-naphthalen-1-ylmethyleneamino)-3,3-dimethyl-2c-[(toluene-4-sulfonyloxy)-acetyl]-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptan-7-one