9-Hydroxy-9-(2-methoxy-phenoxymethyl)-2,12-dioxo-3-oxa-6-aza-tricyclo[6.3.1.01,5]dodecane-6-carboxylic acid benzyl ester

1-<(benzyloxy)carbonyl>-2-(hydroxymethyl)-4-oxo-3-piperidinecarboxylic acid γ-lactone

methyl 1,4,5,6-tetrahydro-1-<(benzyloxy)carbonyl>-2-(bromomethyl)-4-oxo-3-pyridinecarboxylate

9-Hydroxy-9-(2-methoxy-phenoxymethyl)-3-oxa-6-aza-tricyclo[6.3.1.01,5]dodecane-2,12-dione

1,4,5,6-tetrahydro-1-<(benzyloxy)carbonyl>-2-(hydroxymethyl)-4-oxo-3-pyridinecarboxylic acid γ-lactone