(2Z,6Z)-farnesyl diphosphate = germacrene A + diphosphate
(2z,6z)-farnesyl diphosphate = germacrene a + diphosphate
(2Z,6Z)-farnesyl diphosphate = germacrene A + diphosphate
(2z,6z)-farnesyl diphosphate = germacrene a + diphosphate