Carboxypeptidase that catalyzes the release of a C-terminal amino acid, but has little or no action with -Asp, -Glu, -Arg, -Lys or -Pro (By similarity). Catalyzes the conversion of leukotriene C4 to leukotriene F4 via the hydrolysis of an amide bond (PubMed:12729612). Release of a C-terminal amino acid, but little or no action with -Asp, -Glu, -Arg, -Lys or -Pro. H2O + leukotriene C4 = glycine + leukotriene F4 Binds 1 zinc ion per subunit. Monomer. May form a complex with proelastase 2. Pancreas. Belongs to the peptidase M14 family.