- Synonyms: MTB; 3,3'-Bis[N,N-di(carboxymethyl)aminomethyl]thymolsulfonephthalein, sodium saltr- C37H40N2Na4O13Sr- M = 844,76 g/molr- CAS [1945-77-3]r- EINECS-No.: 217-743-3r- Solub. in water: (20 ºC): ~ 460 g/lr- Tariff number: 2934 99 90 90r- Applications: analytical chemistry, indicator, titrant in volumetric analysis (metals).rrSPECIFICATIONSrAbsorption maximum l (in ethanol) : 430 - 440 nm rAbsorptivity (A1%/1 cm; l max.): 90 - 110 rinsoluble in water: passes testrsuitability as indicator : passes testrloss on drying : max. 7 % r