prov:value
| - s a 1-sulfonyloxy-2-pyridone of the formula (I) ##STR5## in which R1 is a hydrogen atom or an alkyl, cycloalkyl, aryl, aralkenyl, heteroaryl or heteroaralkenyl radical, R2 is hydrogen, chlorine, bromine or an alkyl, cycloalkyl, aryl or heteroaryl radical, or R1 and R2 together form a five- to eight-membered ring, R3 is hydrogen or an alkyl radical, R4 is hydrogen, halogen, nitro, acylamino, cyano,
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