CHP
20P 、
2-Chloroacetyl-4,5-dibenzyloxypyridine 、 (3S-trans)-[4-methyl-2-oxo-3-[[(1,1-dimethylethoxy)carbonyl]amino]-1-azetidinyl]phosphonic acid, methyl ester, tetrabutylammonium salt 生成 (2S-trans)-[1-[[2-[4,5-Bis(phenylmethoxy)-2-pyridinyl]-2-oxoethoxy]hydroxyphosphinyl]-2-methyl-4-oxo-3-azetidinyl]carbamic acid, 1,1,-dimethylethyl ester, monopotassium salt