A 1-aza(3.2.0]bicycloheptan-2-carboxylic acid or salt or ester thereof having a substituent at position 7 of the formula:
wherein R1 and R2 are independently hydrogen, halogen or an organic group.
一种 1-氮杂(3.2.0]双
环庚烷-2-
羧酸或其盐或酯,在式中第 7 位有一个取代基:
其中 R1 和 R2 独立地为氢、卤素或有机基团。