for erythrityl tetranitrate ( etn , ec50 = 14.5 microm ) , glyceryl trinitrate ( gtn , ec50 = 60 microm ) , isoidide dinitrate ( iidn , ec50 = 0.24 mm ) and isosorbide-5-nitrate ( is-5-n , ec50 = 1 mm ) , we were able to set up an equation by which the ec50 could be calculated from the number of nitrate groups per molecule .
C0017887
glyceryl
C0028125
nitrate