乙醇 、 (6
R)-2-methoxy-3-methylene-8-oxo-7
t-(2-thiophen-2-yl-acetylamino)-(6
rH)-5-thia-1-aza-bicyclo[4.2.0]octane-2ξ-carboxylic acid 在
盐酸 作用下,
生成
(6R)-3-ethoxymethyl-8-oxo-7t-(2-thiophen-2-yl-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester