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.
化合物的公式为##STR1##其中R从由氢和易于通过酸
水解或氢解去除的基团中选择,R'从由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通过酸
水解或氢解去除的基团中选择,A从氢,碱
金属和碱土
金属或
镁的等效物以及有机胺基中选择,但是当R'是易于通过酸
水解或氢解去除的基团时,R也是如此,当R'为氢时,R也是氢,波浪线表示OR'基团可以处于两个可能的同构或异构位置,具有抗生素活性和制备它们的过程。