描述:
3-[[4(S)-[4-(aminoiminomethyl)phenyl]tetrahydro-3-methyl-2-oxo-2H-1,3-oxazin-6(R)-yl]acetyl]aminopropionic acid methyl ester 以90%的产率得到3-[[4(S)-[4-(aminoiminomethyl)phenyl]tetrahydro-3-methyl-2-oxo-2H-1,3-oxazin-6(R)-yl]acetyl]aminopropionic acid HCl salt