previous methods for high performance liquid chromatography ( hplc ) measurements of myocardial high energy phosphate ( hep ) compounds have used either two different assays or a gradient technique in order to determine both creatine compounds ( creatine ( cr ) , creatine phosphate ( crp ) ) , and adenine nucleotides ( atp , adp , amp ) .
C0010286
creatine
C0031634
creatine phosphate