2-hydroxy-2-(3-methyl-butyl)-succinic acid 1-methyl ester 、
Cephalotaxin 生成 (Ξ)-2-hydroxy-2-(3-methyl-butyl)-succinic acid 4-((3aR)-2-methoxy-(3arC4,14bc)-1,5,6,8,9,14b-hexahydro-4H-cyclopenta[b][1,3]dioxolo[4',5':4,5]benzo[1,2-d]pyrrolo[1,2-a]azepin-1t-yl) ester 1-methyl ester