in contrast to placebo , 500 mg theophylline in ethylenediamine or proxyphylline and diprophylline significantly decreased mean specific airway resistance ( sraw in cmh2o.s ) from 31.2 to 23.6 or 34.2 to 23.5 at theophylline serum concentrations of 14.4 or 16.6 mg/l , respectively .
C0013360
diprophylline
C0039771
theophylline