3.4.22.B50 Z-KKAG-7-amido-4-methylcoumarin + H2O the catalytic efficiency toward Z-KKAG-7-amido-4-methylcoumarin is 5times higher than that for Z-LRGG-7-amido-4-methylcoumarin infectious bronchitis virus Z-KKAG + 7-amino-4-methylcoumarin - ? 432499 3.4.22.B50 Z-LRGG-7-amido-4-methylcoumarin + H2O - Alphacoronavirus ? - ? 385964 3.4.22.B50 Z-LRGG-7-amido-4-methylcoumarin + H2O - Alphacoronavirus SARS-CoV ? - ? 385964 3.4.22.B50 Z-LRGG-7-amido-4-methylcoumarin + H2O - infectious bronchitis virus Z-LRGG + 7-amino-4-methylcoumarin - ? 432502