Wittig reactions with ?-lactam carbonyls: a convenient means of protection. X-Ray crystal structure of p-nitrobenzyl-(2R,5R)-Z-7-methoxycarbonylmethylene-Z-3-(?-phthalimidoethylidene)-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylate

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