24 ABSTRACTA novel organic amine salt or salt with quaternary ammonium ion of 3-{R(2E)-2-{1- [5-(4-t-butylphenyl) 4 hydroxy-3-thienyl]ethylidenelhydrazino)carbonothioyllaminolbenzoic acid having useful properties 5 as a drug is provided.A novel organic amine or salt with quaternary ammonium ion of 3-T(2E)-2-{115- (44-butylphenyl)-4-hydroxy-3-thienyllethylidene}hydrazino)carbonothioygaminolbenzoic acid, a method for producing the organic amine salt or the salt with quaternary ammonium ion and a platelet increasing agent.