Novel penicillin derivatives of the formula ##STR1## and pharmaceutically acceptable salts thereof, wherein R is hydrogen or hydroxy, are produced by acylating ampicillin, amoxicillin or a salt thereof with 4-hydroxy-pyrazino[2,3-f]quinoline-3-carboxylic acid or its functional derivative. They have high anti-pseudomonas activity and other antibacterial activity against gram-positive and gram-negative bacteria, and are of extremely low toxicity.
根据上述公式,直接合成R为氢或羟基的新型青霭霉素衍
生物及其药用盐,方法是通过用4-
羟基吡啶并[2,3-f]
喹啉-3-羧酸或其功能衍
生物对
氨苄
青霉素、
阿莫西林或其盐进行酰化。这些衍
生物具有高抗假单胞菌活性,对革兰氏阳性和阴性细菌具有其他抗菌活性,并且毒性极低。