130187-62-1 1H-Purine-2,6-dione, 3,7-dihydro-8-((2-(dibutylamino)ethyl)amino)-1,3-dimethyl-7-(phenylmethyl)-, (Z)-2-butenedioate (1:1) 7-Benzyl-8-(2-N,N-di-n-butylaminoethyl)aminotheophylline hydromaleate