A pharmaceutical preparation comprising an antibiotic, a pharmaceutical excipient therefor, and in addition an oxapenem-3-carboxylic acid of the formula ##STR1## or a pharmaceutically acceptable salt, ester or amide in which R.sup.1 and R.sup.2 each independently is hydrogen or a pharmaceutically acceptable group having 1 to 10 carbon atoms which is connected with the balance of the molecule via carbon-carbon single bonds, and in which R.sup.3, R.sup.4 and R.sup.5 each independently is a pharmaceutically acceptable group having 1 to 10 carbon atoms which is connected with the balance of the molecule via carbon-carbon single bonds.
一种药物制剂,包括一种抗生素、一种药物赋形剂,以及另外一种氧杂-3-
羧酸苄
青霉素,其
化学式为##STR1## 或其药学上可接受的盐、酯或酰胺,其中R.sup.1和R.sup.2各自独立地是氢或具有1至10个碳原子的药学上可接受的基团,该基团通过碳-碳单键与分子的平衡部分相连,而R.sup.3、R.sup.4和R.sup.5各自独立地是具有1至10个碳原子的药学上可接受的基团,该基团通过碳-碳单键与分子的平衡部分相连。