(1R,5R,6R,7S)-6,7-(isopropylidenedioxy)-3-oxabicyclo[3.2.1]octane-2-one

benzyl 2-<2-<(1'R,2'S,3'R,4'R)-2',3'-dibenzoyloxy-4'-(benzoyloxymethyl)cyclopentyl>thiazole-4-carboxamido>-3-methylbut-2-enoate

benzyl 2-<2-<(1'S,2'R,3'S,4'S)-2',3'-dibenzoyloxy-4'-(benzoyloxymethyl)cyclopentyl>thiazole-4-carboxamido>-3-methylbut-2-enoate

benzyl 6β-<(1'S,2'R,3'S,4'S)-2',3'-dibenzoyloxy-4'-(benzoyloxymethyl)cyclopentane-1'-carboxamido>penicillanate

benzyl 6β-<(1'R,2'S,3'R,4'R)-2',3'-dibenzoyloxy-4'-(benzoyloxymethyl)cyclopentane-1'-carboxamido>penicillanate 1β-oxide