| 摘要 |
Cephalosporin deriv. I(R = 5-6 membered heterocycle which can be substd. by 1-4C lower, alkyl, lower cycloalkyl, lower alkenyl, CF3, NH2, NHR2, phenyl, methylthio, benzyl, halogen ; R1 = H, alkali metal, esterizing group; R2 =1-4C lower alkyl, lower alkoxy, alkyleneoxy) was prepd. by the reaction of I with aldehyde, thiol compds. and it's hydrolysis.
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