发明授权
US4500709A Thiinyl and oxothiolyl derivatives 失效
噻吩基和氧代噻吩衍生物

Thiinyl and oxothiolyl derivatives
摘要:
This invention relates to novel compounds useful as intermediates in the preparation of cephalosporin compounds of antibacterial activity, having the formula ##STR1## wherein R.sup.1 is a group of the formula ##STR2## in which X is sulfur, oxygen or substituted or unsubstituted imino, andR.sup.2 is hydrogen or a saturated or unsaturated aliphatic hydrocarbon residue,a derivative at the carboxy group thereof and salt thereof.
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