| http://www.w3.org/ns/prov#value | - Sweetening agents according to claim 1,wherein: X is CN, COOCH3, COOC2 H5, COCH3, CONHCH3, SO2 CH3 or SO2 NHCH3 ; n is 1; M is a hydrogen atom or a Na+, K+, NH4 +, 1/2 Ca2+ or 1/2 Mg2+ cation; Y is COOCH3, CH3 or CH2 OH; andZ is a butyl, pentyl, isobutyl, isopentyl, phenyl, cyclohexyl, benzyl, cyclohexylmethyl, propylamide, 2-butylamide, dicyclopropylcarbinylamide or 2,2,4,4-tetramethylthietan-3-y
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