(2E,6E)-farnesyl diphosphate => germacrene A + diphosphate
(2e,6e)-farnesyl diphosphate => germacrene a + diphosphate
(2E,6E)-farnesyl diphosphate => germacrene A + diphosphate
(2e,6e)-farnesyl diphosphate => germacrene a + diphosphate