MeOSuc-Ala-Phe-Lys-AMC TFA is a peptide substrate of plasmin[1].
References
[1] Dall jl, et, al. Immaturity of microvessels in haemorrhagic plaques is associated with proteolytic degradation of angiogenic factors. Cardiovasc Res. 2010 Jan 1;85(1):184-93. DOI:10.1093/cvr/cvp253