Terrence W. Doyle et al. Nuclear analogs of β-lactam antibiotics. II. Synthesis of O-2-isocephems.
Can. J. Chem., 1977, 55, 3, p. 484-507.
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http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=eng&journal=cjc&volume=55&year=0&issue=3&msno=v77-070Спасибо!