p-Phenylthioaniline derivs. of formula (I) and their pharmaceutically acceptable acid addn. salts wherein R8= H, F, Cl or Br; R9= H or Cl; one of R8 and R9 is H, but both are not H; R10= -CH2CN, -COCH2NH2 or (5-1H-tetrazolyl)methyl. A method for modulation of immune response system in animals by administration of pphenylthioaniline derivatives.
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