4-Methylumbelliferone 4-guanidinobenzoate Benzoic acid, p-guanidino-, 4-methyl-2-oxo-2H-1-benzopyran-7-yl ester Coumarin, 4-methyl-7-hydroxy-, p-guanidinobenzoate DH1422000 MUGB p-Guanidinobenzoic acid 4-methyl-2-oxo-2H-1-benzopyran-7-yl ester