| http://www.w3.org/ns/prov#value | - A compound of the formula: ##STR122## wherein: R.sub.1 is --SO.sub.3 H;R.sub.2 is a lower alkyl group;B is phenyl or halogenophenyl;Y is a straight-chain or branched-chain alkylene group of C.sub.3.about.6 or an alkenylene group of C.sub.3.about.5, and pharmaceutically acceptable alkali-additon salts thereof.4.
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