the key reaction is the production of hydrogen peroxide by the oxidase action on choline , whereby hydrogen peroxide reacts with n-ethyl-n- ( 3-methylphenyl ) -n'-acetylethylenediamine and 4-aminoantipyrine ( ampyrone ) in the presence of peroxidase to produce a purple color so that seminal fluid can be identified .
C0031180
peroxide
C0020281
hydrogen peroxide