isopentenyldehydrorhodopin + AH2 => dihydroisopentenyldehydrorhodopin + A
isopentenyldehydrorhodopin + ah2 => dihydroisopentenyldehydrorhodopin + a
isopentenyldehydrorhodopin + AH2 => dihydroisopentenyldehydrorhodopin + A
isopentenyldehydrorhodopin + ah2 => dihydroisopentenyldehydrorhodopin + a