This invention provides the intermediates of formula II-A below, useful to make the pterin compounds of formula I below. The pterin compounds are used in human and veterinary medicine. ##STR1## wherein R represents a lower alkyl of 1 to 8 carbons.
该发明提供了下式II-A的中间体,用于制备下式I的
酪氨酸类化合物。这些
酪氨酸类化合物在人类和兽医学中被使用。其中R代表1到8个碳的低级烷基。