Compounds of the formula ##STR1## wherein R is selected from the group consisting of hydrogen and groups easily removable by acid hydrolysis or hydrogenolysis, R' is selected from the group consisting of hydrogen, alkyl of 1 to 4 carbon atoms, alkenyl and alkynyl of 2 to 4 carbon atoms and groups easily removable by acid hydrolysis or hydrogenolysis, A is selected from the group consisting of hydrogen, alkali metal and equivalents of an alkaline earth metal or magnesium and an organic amine base with the proviso that when R' is a group easily removable by acid hydrolysis or hydrogenolysis, R is also and when R' is hydrogen, R also is hydrogen and the wavy line means the OR' group may be in either one of the two possible syn or anti positions having antibiotic activity and process for their preparation.
式为##
STR1##的化合物,其中R从
氢和易于酸
水解或
氢解的基团中选择,R'从
氢、1至4个
碳原子的烷基、2至4个
碳原子的
烯基和炔基以及易于酸
水解或
氢解的基团中选择,A从
氢、碱
金属和碱土
金属或
镁的当量物以及有
抗生素活性的有机胺基中选择,但当R'是易于酸
水解或
氢解的基团时,R也是如此;当R'是
氢时,R也是
氢;波浪线表示OR'基团可以处于两种可能的同构或反构位置之一,具有
抗生素活性和其制备方法。