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