3,4,5-trimethoxybenzoic acid 1,2-ethanediylbis(methylimino)-3,1-propanediyl) ester mixt. with N,N-diethyl-4-hydroxy-3-methoxybenzamide & 3,7- dihydro-7-(2-hydroxyethyl)-1,3-dimethyl-1H-purine- 2,6-dione