73554-90-2 Boc-phe-ser-arg-mca L-Argininamide, N-((1,1-dimethylethoxy)carbonyl)-L-phenylalanyl-L-seryl-N-(4-methyl-2-oxo-2H-1-benzopyran-7-yl)- t-Butyloxycarbonyl-phe-ser-arg-mca tertiary-Butyloxycarbonyl-phenylalanyl-seryl-arginyl-4-methylcoumarin-7-amide