The invention relates to intermediate compounds of the formula: ##STR1## wherein R.sup.3 is a lower alkyl, hydroxy(lower)alkyl or a protected hydroxy(lower)alkyl, R.sup.4 is amino or a protected amino group, and R.sup.5 is hydrogen or lower alkyl, or a salt thereof, useful in the preparation of compounds of antimicrobial activity.
本发明涉及式为:##STR1##的中间化合物,其中R.sup.3是较低的烷基,羟基(较低)烷基或保护羟基(较低)烷基,R.sup.4是
氨基或保护
氨基团,R.sup.5是氢或较低的烷基,或其盐,在制备抗微
生物活性化合物方面有用。