26833-86-3 4-Methylcephalotaxine 2,3-dihydroxy-2-(3-methylbutyl)butanedioate ester Cephalotaxine, 4-methyl (2R,3S)-2,3-dihydroxy-2-(3-methylbutyl)butanedioate (ester) (9CI) Cephalotaxine, 4-methyl 2,3-dihydroxy-2-(3-methylbutyl)butanedioate (ester), (3(2R,3S))- (9CI) Cephalotaxine, 4-methyl-2,3-dihydroxy-2-(3-methylbutyl)butanedioate (ester), (3-(2R,3S))- Isoharringtonine NSC 141634