26833-86-3 Cephalotaxine, 4-methyl 2,3-dihydroxy-2-(3-methylbutyl)butanedioate (ester) Cephalotaxine, 4-methyl 2,3-dihydroxy-2-(3-methylbutyl)butanedioate (ester), [3(2R,3S)]- Cephalotaxine, 4-methyl 2,3-dihydroxy-2-(3-methylbutyl)butanedioate (ester),[3(2R,3S)]- ISOHARRINGTONINE NSC141634