(2E)-geranyl diphosphate <=> (1R,4S)-camphene + diphosphate
(2e)-geranyl diphosphate <=> (1r,4s)-camphene + diphosphate
(2E)-geranyl diphosphate <=> (1R,4S)-camphene + diphosphate
(2e)-geranyl diphosphate <=> (1r,4s)-camphene + diphosphate