prov:value
| - H--CHR--COOH, with the provision that at least one of X, Y and V is other than H, R is the side chain of an amino acid, R1 is a hydrogen atom or a pharmaceutically acceptable metal salt, R2 is a single amino acid connected to the --SO2 bridge through its amine function, R3 is --CH2 --CO--NH--R4, R4 is alkyl, phenyl or, benzyl and further when X is --SO3 R1, then at least one of Y or V is other tha
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