(2E,6E)-farnesyl diphosphate <=> germacrene C + diphosphate
(2e,6e)-farnesyl diphosphate <=> germacrene c + diphosphate
(2E,6E)-farnesyl diphosphate <=> germacrene C + diphosphate
(2e,6e)-farnesyl diphosphate <=> germacrene c + diphosphate