a photochemical analogue of strophanthidin , 3-azidoacetylstrophanthidin ( aas ) was synthesized and tested as a cardiotonic steroid ( cs ) site directed photoaffinity label for na+ + k+-atpase ( atp phosphohydrolase , e.c . 3.6.1.3 ) .
C0001479
na
C0001473
atp phosphohydrolase