(R)-D-gamma-Glutamyl-N-(3-methoxy-2-oxo-1-sulfo-3-azetidinyl)-L-alaninamide 77900-75-5 Isosulfazecin L-Alaninamide, D-gamma-glutamyl-N-(3-methoxy-2-oxo-1-sulfo-3-azetidinyl)-, (R)-