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