| http://www.w3.org/ns/prov#value | - In another embodiment the fluorogenic substrates have formula II wherein R1 is a group which contains within it a leaving group which can be displaced by peroxide acting as a nucleophile and is selected from aryl esters (???COOAr), substituted alkyl esters (???COOR) wherein the alkyl group R is substituted with electron-withdrawing groups such as halogen, cyano and nitro which increase the leaving
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