2.5.1.92 (2Z,6Z)-farnesyl diphosphate synthase bergamotene biosynthesis II 4.2.3.53 (+)-endo-beta-bergamotene synthase [(2Z,6Z)-farnesyl diphosphate cyclizing] bergamotene biosynthesis II 4.2.3.54 (-)-endo-alpha-bergamotene synthase [(2Z,6Z)-farnesyl diphosphate cyclizing] bergamotene biosynthesis II