(2Z,6Z)-farnesyl diphosphate <=> germacrene C + diphosphate
(2z,6z)-farnesyl diphosphate <=> germacrene c + diphosphate
(2Z,6Z)-farnesyl diphosphate <=> germacrene C + diphosphate
(2z,6z)-farnesyl diphosphate <=> germacrene c + diphosphate