prov:value
| - e chain of an amino acid, R1 is a hydrogen atom or 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 than H, and where V is present, at least one of X or Y is other than H; and X, Y, and V are as defi
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