Ureylenebis(anionic substituted phenylene carbonyl)imino naphthalene sulfonic acids and naphthalene carboxylic acids and their salts, which are useful as inhibitors of the complement system of warm-blooded animals. Naphthyl sulfobenzoamido salts, which are new intermediates for the preparation of the active ureylenes, and the process for their preparation.
Novel ureylenebis-[substituted-phenylenecarbonylimino-substituted-phenylenecarbo nylimino-naphthalenetrisulfonic acid, alkali metal salts], useful as inhibitors of the complement system of warm-blooded animals, the amino-substituted phenylenecarbonylimino, substituted-phenylenecarbonylimino-naphthalenetrisulfonic acid, alkali metal salts, which are new intermediates for the preparation of the active ureylenes, and the process for their preparation.