73554-93-5 Boc-leu-ser-thr-arg-mca Boc-leucyl-seryl-threonyl-arginine-4-methylcoumaryl-7-amide L-Argininamide, N-((1,1-dimethylethoxy)carbonyl)-L-leucyl-L-seryl-L-threonyl-N-(4-methyl-2-oxo-2H-1-benzopyran-7-yl)-