(4aS,7aS)-1-methyloctahydro-1H-pyrrolo[3,4-b]pyridine

(4aS,7aS)-Octahydro-1-methyl-1H-pyrrolo[3,4-b]pyridine is used in the synthetic preparation of penemylmethyl and cephalosporinylmethyl 7-(diazabicyclonono)quinolonecarboxylates as bactericides.