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Rohm Pharma Gmbh

Heinrich Knauf

Ernst Mutschler

Karl-Dieter Voelger

Christian Rietzel

Pteridine compounds, useful as diuretics, of the formula ##STR1## wherein R.sub.1 and R.sub.2 taken alone are, independently of each other, hydrogen, alkyl having from 1 to 6 carbon atoms, or benzyl, or wherein R.sub.1 and R.sub.2, taken together with the nitrogen atom to which they are bound, form a five- or six-membered heterocyclic ring system or such a ring containing one or two further hetero atoms, or wherein R.sub.1 and R.sub.2 together with the nitrogen are ##STR2##

Pteridine compounds

Pharmaceutical compositions having a diuretic effect and containing as the active ingredient a compound of the formula ##STR1## wherein R is hydrogen, a pharmaceutically acceptable cation, methyl, or a hydrophilic group R', are disclosed, as are novel compounds wherein R is R'.

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Munich, Georgia

Heinrich Knauf